diff --git a/src/Spout/Writer/CSV/Writer.php b/src/Spout/Writer/CSV/Writer.php
index 8bf3c0f..a17f5e3 100644
--- a/src/Spout/Writer/CSV/Writer.php
+++ b/src/Spout/Writer/CSV/Writer.php
@@ -6,6 +6,7 @@ use Box\Spout\Writer\WriterAbstract;
 use Box\Spout\Common\Exception\IOException;
 use Box\Spout\Common\Helper\EncodingHelper;
 use Box\Spout\Writer\Common\Entity\Options;
+use Box\Spout\Writer\Common\Entity\Row;
 
 /**
  * Class Writer
@@ -77,20 +78,20 @@ class Writer extends WriterAbstract
     }
 
     /**
-     * Adds data to the currently opened writer.
+     * Adds a row to the currently opened writer.
+     *
+     * @param Row $row The row containing cells and styles
      *
-     * @param  array $dataRow Array containing data to be written.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @param \Box\Spout\Writer\Common\Entity\Style\Style $style Ignored here since CSV does not support styling.
      * @return void
-     * @throws \Box\Spout\Common\Exception\IOException If unable to write data
+     * @throws IOException If unable to write data
+     * @internal param \Box\Spout\Writer\Common\Entity\Style\Style $style Ignored here since CSV does not support styling.
      */
-    protected function addRowToWriter(array $dataRow, $style)
+    protected function addRowToWriter(Row $row)
     {
         $fieldDelimiter = $this->optionsManager->getOption(Options::FIELD_DELIMITER);
         $fieldEnclosure = $this->optionsManager->getOption(Options::FIELD_ENCLOSURE);
 
-        $wasWriteSuccessful = $this->globalFunctionsHelper->fputcsv($this->filePointer, $dataRow, $fieldDelimiter, $fieldEnclosure);
+        $wasWriteSuccessful = $this->globalFunctionsHelper->fputcsv($this->filePointer, $row->getCells(), $fieldDelimiter, $fieldEnclosure);
         if ($wasWriteSuccessful === false) {
             throw new IOException('Unable to write data');
         }
diff --git a/src/Spout/Writer/Common/Entity/Cell.php b/src/Spout/Writer/Common/Entity/Cell.php
index fc8112f..587de27 100644
--- a/src/Spout/Writer/Common/Entity/Cell.php
+++ b/src/Spout/Writer/Common/Entity/Cell.php
@@ -2,8 +2,9 @@
 
 namespace Box\Spout\Writer\Common\Entity;
 
-use Box\Spout\Writer\Common\Helper\CellHelper;
 use Box\Spout\Writer\Common\Entity\Style\Style;
+use Box\Spout\Writer\Common\Helper\CellHelper;
+use Box\Spout\Writer\Common\Manager\Style\StyleMerger;
 
 /**
  * Class Cell
@@ -61,6 +62,11 @@ class Cell
      */
     protected $style = null;
 
+    /**
+     * @var StyleMerger
+     */
+    protected $styleMerger;
+
     /**
      * Cell constructor.
      * @param $value mixed
@@ -72,6 +78,8 @@ class Cell
         if ($style) {
             $this->setStyle($style);
         }
+
+        $this->styleMerger = new StyleMerger();
     }
 
     /**
@@ -100,10 +108,13 @@ class Cell
     }
 
     /**
-     * @return Style|null
+     * @return Style
      */
     public function getStyle()
     {
+        if (!isset($this->style)) {
+            $this->setStyle(new Style());
+        }
         return $this->style;
     }
 
@@ -191,4 +202,18 @@ class Cell
     {
         return (string)$this->value;
     }
+
+    /**
+     * @param Style $style|null
+     * @return $this
+     */
+    public function applyStyle(Style $style = null)
+    {
+        if ($style === null) {
+            return $this;
+        }
+        $merged = $this->styleMerger->merge($this->getStyle(), $style);
+        $this->setStyle($merged);
+        return $this;
+    }
 }
diff --git a/src/Spout/Writer/Common/Entity/Row.php b/src/Spout/Writer/Common/Entity/Row.php
index 5aa1c0c..56e7ab2 100644
--- a/src/Spout/Writer/Common/Entity/Row.php
+++ b/src/Spout/Writer/Common/Entity/Row.php
@@ -3,6 +3,7 @@
 namespace Box\Spout\Writer\Common\Entity;
 
 use Box\Spout\Writer\Common\Entity\Style\Style;
+use Box\Spout\Writer\Common\Manager\Style\StyleMerger;
 
 class Row
 {
@@ -18,6 +19,11 @@ class Row
      */
     protected $style = null;
 
+    /**
+     * @var StyleMerger
+     */
+    protected $styleMerger;
+
     /**
      * Row constructor.
      * @param array $cells
@@ -28,6 +34,8 @@ class Row
         $this
             ->setCells($cells)
             ->setStyle($style);
+
+        $this->styleMerger = new StyleMerger();
     }
 
     /**
@@ -56,6 +64,9 @@ class Row
      */
     public function getStyle()
     {
+        if (!isset($this->style)) {
+            $this->setStyle(new Style());
+        }
         return $this->style;
     }
 
@@ -69,12 +80,38 @@ class Row
         return $this;
     }
 
+    /**
+     * @param Style $style|null
+     * @return $this
+     */
+    public function applyStyle(Style $style = null)
+    {
+        if ($style === null) {
+            return $this;
+        }
+        $merged = $this->styleMerger->merge($this->getStyle(), $style);
+        $this->setStyle($merged);
+        return $this;
+    }
+
     /**
      * @param Cell $cell
+     * @return Row
      */
     public function addCell(Cell $cell)
     {
         $this->cells[] = $cell;
         return $this;
     }
+
+    /**
+     * Detect whether this row is considered empty.
+     * An empty row has either no cells at all - or only empty cells
+     *
+     * @return bool
+     */
+    public function isEmpty()
+    {
+        return count($this->cells) === 0 || (count($this->cells) === 1 && $this->cells[0]->isEmpty());
+    }
 }
diff --git a/src/Spout/Writer/Common/Manager/Style/StyleManager.php b/src/Spout/Writer/Common/Manager/Style/StyleManager.php
index 1f64166..ea6561e 100644
--- a/src/Spout/Writer/Common/Manager/Style/StyleManager.php
+++ b/src/Spout/Writer/Common/Manager/Style/StyleManager.php
@@ -2,6 +2,7 @@
 
 namespace Box\Spout\Writer\Common\Manager\Style;
 
+use Box\Spout\Writer\Common\Entity\Cell;
 use Box\Spout\Writer\Common\Entity\Style\Style;
 
 /**
@@ -46,17 +47,17 @@ class StyleManager implements StyleManagerInterface
         return $this->styleRegistry->registerStyle($style);
     }
 
+
     /**
      * Apply additional styles if the given row needs it.
      * Typically, set "wrap text" if a cell contains a new line.
      *
-     * @param Style $style The original style
-     * @param array $dataRow The row the style will be applied to
-     * @return Style The updated style
+     * @param Cell $cell
+     * @return Style
      */
-    public function applyExtraStylesIfNeeded($style, $dataRow)
+    public function applyExtraStylesIfNeeded(Cell $cell)
     {
-        $updatedStyle = $this->applyWrapTextIfCellContainsNewLine($style, $dataRow);
+        $updatedStyle = $this->applyWrapTextIfCellContainsNewLine($cell);
         return $updatedStyle;
     }
 
@@ -69,24 +70,18 @@ class StyleManager implements StyleManagerInterface
      *        A workaround would be to encode "\n" as "_x000D_" but it does not work
      *        on the Windows version of Excel...
      *
-     * @param Style $style The original style
-     * @param array $dataRow The row the style will be applied to
-     * @return Style The eventually updated style
+     * @param Cell $cell The cell the style should be applied to
+     * @return \Box\Spout\Writer\Common\Entity\Style\Style The eventually updated style
      */
-    protected function applyWrapTextIfCellContainsNewLine($style, $dataRow)
+    protected function applyWrapTextIfCellContainsNewLine(Cell $cell)
     {
         // if the "wrap text" option is already set, no-op
-        if ($style->hasSetWrapText()) {
-            return $style;
+        if ($cell->getStyle()->hasSetWrapText()) {
+            return $cell->getStyle();
         }
-
-        foreach ($dataRow as $cell) {
-            if (is_string($cell) && strpos($cell, "\n") !== false) {
-                $style->setShouldWrapText();
-                break;
-            }
+        if ($cell->isString() && strpos($cell->getValue(), "\n") !== false) {
+            $cell->getStyle()->setShouldWrapText();
         }
-
-        return $style;
+        return $cell->getStyle();
     }
 }
diff --git a/src/Spout/Writer/Common/Manager/Style/StyleManagerInterface.php b/src/Spout/Writer/Common/Manager/Style/StyleManagerInterface.php
index f9f7349..d75506e 100644
--- a/src/Spout/Writer/Common/Manager/Style/StyleManagerInterface.php
+++ b/src/Spout/Writer/Common/Manager/Style/StyleManagerInterface.php
@@ -2,8 +2,10 @@
 
 namespace Box\Spout\Writer\Common\Manager\Style;
 
+use Box\Spout\Writer\Common\Entity\Cell;
 use Box\Spout\Writer\Common\Entity\Style\Style;
 
+
 /**
  * Interface StyleHManagernterface
  *
@@ -24,9 +26,8 @@ interface StyleManagerInterface
      * Apply additional styles if the given row needs it.
      * Typically, set "wrap text" if a cell contains a new line.
      *
-     * @param Style $style The original style
-     * @param array $dataRow The row the style will be applied to
-     * @return Style The updated style
+     * @param Cell $cell
+     * @return \Box\Spout\Writer\Common\Entity\Style\Style The updated style
      */
-    public function applyExtraStylesIfNeeded($style, $dataRow);
+    public function applyExtraStylesIfNeeded(Cell $cell);
 }
diff --git a/src/Spout/Writer/Common/Manager/WorkbookManagerAbstract.php b/src/Spout/Writer/Common/Manager/WorkbookManagerAbstract.php
index c10af47..4732d04 100644
--- a/src/Spout/Writer/Common/Manager/WorkbookManagerAbstract.php
+++ b/src/Spout/Writer/Common/Manager/WorkbookManagerAbstract.php
@@ -12,7 +12,6 @@ use Box\Spout\Writer\Common\Entity\Worksheet;
 use Box\Spout\Writer\Exception\SheetNotFoundException;
 use Box\Spout\Writer\Exception\WriterException;
 use Box\Spout\Writer\Common\Creator\EntityFactory;
-use Box\Spout\Writer\Common\Entity\Style\Style;
 
 /**
  * Class WorkbookManagerAbstract
@@ -192,18 +191,16 @@ abstract class WorkbookManagerAbstract implements WorkbookManagerInterface
     }
 
     /**
-     * Adds data to the current sheet.
+     * Adds a row to the current sheet.
      * If shouldCreateNewSheetsAutomatically option is set to true, it will handle pagination
      * with the creation of new worksheets if one worksheet has reached its maximum capicity.
      *
-     * @param array $dataRow Array containing data to be written. Cannot be empty.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @param Style $style Style to be applied to the row.
+     * @param Row $row The row to added
      * @return void
      * @throws IOException If trying to create a new sheet and unable to open the sheet for writing
      * @throws WriterException If unable to write data
      */
-    public function addRowToCurrentWorksheet($dataRow, Style $style)
+    public function addRowToCurrentWorksheet(Row $row)
     {
         $currentWorksheet = $this->getCurrentWorksheet();
         $hasReachedMaxRows = $this->hasCurrentWorkseetReachedMaxRows();
@@ -214,12 +211,12 @@ abstract class WorkbookManagerAbstract implements WorkbookManagerInterface
             if ($this->optionManager->getOption(Options::SHOULD_CREATE_NEW_SHEETS_AUTOMATICALLY)) {
                 $currentWorksheet = $this->addNewSheetAndMakeItCurrent();
 
-                $this->addRowWithStyleToWorksheet($currentWorksheet, $dataRow, $style);
+                $this->addRowWithStyleToWorksheet($currentWorksheet, $row);
             } else {
                 // otherwise, do nothing as the data won't be written anyways
             }
         } else {
-            $this->addRowWithStyleToWorksheet($currentWorksheet, $dataRow, $style);
+            $this->addRowWithStyleToWorksheet($currentWorksheet, $row);
         }
     }
 
@@ -238,19 +235,16 @@ abstract class WorkbookManagerAbstract implements WorkbookManagerInterface
      * @param Worksheet $worksheet Worksheet to write the row to
      * @param array $dataRow Array containing data to be written. Cannot be empty.
      *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @param Style $style Style to be applied to the row.
      * @return void
      * @throws WriterException If unable to write data
      */
-    private function addRowWithStyleToWorksheet(Worksheet $worksheet, $dataRow, Style $style)
+    private function addRowWithStyleToWorksheet(Worksheet $worksheet, Row $row)
     {
-        $updatedStyle = $this->styleManager->applyExtraStylesIfNeeded($style, $dataRow);
-        $registeredStyle = $this->styleManager->registerStyle($updatedStyle);
-        $this->worksheetManager->addRow($worksheet, $dataRow, $registeredStyle);
+        $this->worksheetManager->addRow($worksheet, $row);
 
         // update max num columns for the worksheet
         $currentMaxNumColumns = $worksheet->getMaxNumColumns();
-        $cellsCount = count($dataRow);
+        $cellsCount = count($row->getCells());
         $worksheet->setMaxNumColumns(max($currentMaxNumColumns, $cellsCount));
     }
 
@@ -312,4 +306,4 @@ abstract class WorkbookManagerAbstract implements WorkbookManagerInterface
         $rootFolder = $this->fileSystemHelper->getRootFolder();
         $this->fileSystemHelper->deleteFolderRecursively($rootFolder);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Spout/Writer/Common/Manager/WorkbookManagerInterface.php b/src/Spout/Writer/Common/Manager/WorkbookManagerInterface.php
index dfaf263..0c23f7f 100644
--- a/src/Spout/Writer/Common/Manager/WorkbookManagerInterface.php
+++ b/src/Spout/Writer/Common/Manager/WorkbookManagerInterface.php
@@ -4,11 +4,12 @@ namespace Box\Spout\Writer\Common\Manager;
 
 use Box\Spout\Common\Exception\IOException;
 use Box\Spout\Writer\Common\Entity\Sheet;
+use Box\Spout\Writer\Common\Entity\Row;
 use Box\Spout\Writer\Common\Entity\Workbook;
 use Box\Spout\Writer\Common\Entity\Worksheet;
+use Box\Spout\Writer\Common\Sheet;
 use Box\Spout\Writer\Exception\SheetNotFoundException;
 use Box\Spout\Writer\Exception\WriterException;
-use Box\Spout\Writer\Common\Entity\Style\Style;
 
 /**
  * Interface WorkbookManagerInterface
@@ -55,19 +56,16 @@ interface WorkbookManagerInterface
     public function setCurrentSheet(Sheet $sheet);
 
     /**
-     * Adds data to the current sheet.
+     * Adds a row to the current sheet.
      * If shouldCreateNewSheetsAutomatically option is set to true, it will handle pagination
      * with the creation of new worksheets if one worksheet has reached its maximum capicity.
      *
-     * @param array $dataRow Array containing data to be written. Cannot be empty.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @param Style $style Style to be applied to the row.
+     * @param Row $row The row to added
      * @return void
      * @throws IOException If trying to create a new sheet and unable to open the sheet for writing
      * @throws WriterException If unable to write data
      */
-    public function addRowToCurrentWorksheet($dataRow, Style $style);
-
+    public function addRowToCurrentWorksheet(Row $row);
     /**
      * Closes the workbook and all its associated sheets.
      * All the necessary files are written to disk and zipped together to create the final file.
@@ -77,4 +75,4 @@ interface WorkbookManagerInterface
      * @return void
      */
     public function close($finalFilePointer);
-}
\ No newline at end of file
+}
diff --git a/src/Spout/Writer/Common/Manager/WorksheetManagerInterface.php b/src/Spout/Writer/Common/Manager/WorksheetManagerInterface.php
index 8f41559..3382b6d 100644
--- a/src/Spout/Writer/Common/Manager/WorksheetManagerInterface.php
+++ b/src/Spout/Writer/Common/Manager/WorksheetManagerInterface.php
@@ -2,8 +2,8 @@
 
 namespace Box\Spout\Writer\Common\Manager;
 
+use Box\Spout\Writer\Common\Entity\Row;
 use Box\Spout\Writer\Common\Entity\Worksheet;
-use Box\Spout\Writer\Common\Entity\Style\Style;
 
 /**
  * Interface WorksheetManagerInterface
@@ -14,17 +14,15 @@ use Box\Spout\Writer\Common\Entity\Style\Style;
 interface WorksheetManagerInterface
 {
     /**
-     * Adds data to the worksheet.
+     * Adds a row to the worksheet.
      *
      * @param Worksheet $worksheet The worksheet to add the row to
-     * @param array $dataRow Array containing data to be written. Cannot be empty.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @param Style $rowStyle Style to be applied to the row. NULL means use default style.
+     * @param Row $row The row to be added
      * @return void
      * @throws \Box\Spout\Common\Exception\IOException If the data cannot be written
      * @throws \Box\Spout\Common\Exception\InvalidArgumentException If a cell value's type is not supported
      */
-    public function addRow(Worksheet $worksheet, $dataRow, $rowStyle);
+    public function addRow(Worksheet $worksheet, Row $row);
 
     /**
      * Prepares the worksheet to accept data
@@ -42,4 +40,4 @@ interface WorksheetManagerInterface
      * @return void
      */
     public function close(Worksheet $worksheet);
-}
\ No newline at end of file
+}
diff --git a/src/Spout/Writer/ODS/Creator/InternalFactory.php b/src/Spout/Writer/ODS/Creator/InternalFactory.php
index 885bff3..24fc0d5 100644
--- a/src/Spout/Writer/ODS/Creator/InternalFactory.php
+++ b/src/Spout/Writer/ODS/Creator/InternalFactory.php
@@ -48,20 +48,22 @@ class InternalFactory implements InternalFactoryInterface
         $fileSystemHelper->createBaseFilesAndFolders();
 
         $styleManager = $this->createStyleManager($optionsManager);
-        $worksheetManager = $this->createWorksheetManager();
+        $worksheetManager = $this->createWorksheetManager($styleManager);
 
         return new WorkbookManager($workbook, $optionsManager, $worksheetManager, $styleManager, $fileSystemHelper, $this->entityFactory);
     }
 
     /**
+     * @param StyleManager $styleManager
      * @return WorksheetManager
      */
-    private function createWorksheetManager()
+    private function createWorksheetManager(StyleManager $styleManager)
     {
         $stringsEscaper = $this->createStringsEscaper();
         $stringsHelper = $this->createStringHelper();
 
-        return new WorksheetManager($stringsEscaper, $stringsHelper);
+
+        return new WorksheetManager($styleManager, $stringsEscaper, $stringsHelper);
     }
 
     /**
diff --git a/src/Spout/Writer/ODS/Manager/WorksheetManager.php b/src/Spout/Writer/ODS/Manager/WorksheetManager.php
index 189ac08..5a46254 100644
--- a/src/Spout/Writer/ODS/Manager/WorksheetManager.php
+++ b/src/Spout/Writer/ODS/Manager/WorksheetManager.php
@@ -6,9 +6,9 @@ use Box\Spout\Common\Exception\InvalidArgumentException;
 use Box\Spout\Common\Exception\IOException;
 use Box\Spout\Common\Helper\StringHelper;
 use Box\Spout\Writer\Common\Entity\Cell;
+use Box\Spout\Writer\Common\Entity\Row;
 use Box\Spout\Writer\Common\Entity\Worksheet;
 use Box\Spout\Writer\Common\Manager\WorksheetManagerInterface;
-use Box\Spout\Writer\Common\Entity\Style\Style;
 use Box\Spout\Writer\ODS\Manager\Style\StyleManager;
 
 /**
@@ -25,6 +25,9 @@ class WorksheetManager implements WorksheetManagerInterface
     /** @var StringHelper String helper */
     private $stringHelper;
 
+    /** @var StyleManager Manages styles */
+    private $styleManager;
+
     /**
      * WorksheetManager constructor.
      *
@@ -32,11 +35,13 @@ class WorksheetManager implements WorksheetManagerInterface
      * @param StringHelper $stringHelper
      */
     public function __construct(
+        StyleManager $styleManager,
         \Box\Spout\Common\Escaper\ODS $stringsEscaper,
         StringHelper $stringHelper)
     {
         $this->stringsEscaper = $stringsEscaper;
         $this->stringHelper = $stringHelper;
+        $this->styleManager = $styleManager;
     }
 
     /**
@@ -87,24 +92,21 @@ class WorksheetManager implements WorksheetManagerInterface
     }
 
     /**
-     * Adds data to the given worksheet.
+    /**
+     * Adds a row to the worksheet.
      *
      * @param Worksheet $worksheet The worksheet to add the row to
-     * @param array $dataRow Array containing data to be written. Cannot be empty.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @param Style $rowStyle Style to be applied to the row. NULL means use default style.
+     * @param Row $row The row to be added
      * @return void
+     *
      * @throws IOException If the data cannot be written
      * @throws InvalidArgumentException If a cell value's type is not supported
      */
-    public function addRow(Worksheet $worksheet, $dataRow, $rowStyle)
+    public function addRow(Worksheet $worksheet, Row $row)
     {
-        // $dataRow can be an associative array. We need to transform
-        // it into a regular array, as we'll use the numeric indexes.
-        $dataRowWithNumericIndexes = array_values($dataRow);
 
-        $styleIndex = ($rowStyle->getId() + 1); // 1-based
-        $cellsCount = count($dataRow);
+        $cells = $row->getCells();
+        $cellsCount = count($cells);
 
         $data = '<table:table-row table:style-name="ro1">';
 
@@ -112,15 +114,22 @@ class WorksheetManager implements WorksheetManagerInterface
         $nextCellIndex = 1;
 
         for ($i = 0; $i < $cellsCount; $i++) {
-            $currentCellValue = $dataRowWithNumericIndexes[$currentCellIndex];
 
-            // Using isset here because it is way faster than array_key_exists...
-            if (!isset($dataRowWithNumericIndexes[$nextCellIndex]) ||
-                $currentCellValue !== $dataRowWithNumericIndexes[$nextCellIndex]) {
+            /** @var Cell $cell */
+            $cell = $row->getCells()[$currentCellIndex];
+            /** @var Cell|null $nextCell */
+            $nextCell = isset($cells[$nextCellIndex]) ? $cells[$nextCellIndex] : null;
+
+            if (null === $nextCell || $cell->getValue() !== $nextCell->getValue()) {
+
+                // Apply styles - the row style is merged at this point
+                $cell->applyStyle($row->getStyle());
+                $this->styleManager->applyExtraStylesIfNeeded($cell);
+                $registeredStyle = $this->styleManager->registerStyle($cell->getStyle());
+                $styleIndex = $registeredStyle->getId() + 1; // 1-based
 
                 $numTimesValueRepeated = ($nextCellIndex - $currentCellIndex);
-                $data .= $this->getCellXML($currentCellValue, $styleIndex, $numTimesValueRepeated);
-
+                $data .= $this->getCellXML($cell, $styleIndex, $numTimesValueRepeated);
                 $currentCellIndex = $nextCellIndex;
             }
 
@@ -142,13 +151,13 @@ class WorksheetManager implements WorksheetManagerInterface
     /**
      * Returns the cell XML content, given its value.
      *
-     * @param mixed $cellValue The value to be written
+     * @param Cell $cell The cell to be written
      * @param int $styleIndex Index of the used style
      * @param int $numTimesValueRepeated Number of times the value is consecutively repeated
      * @return string The cell XML content
      * @throws \Box\Spout\Common\Exception\InvalidArgumentException If a cell value's type is not supported
      */
-    private function getCellXML($cellValue, $styleIndex, $numTimesValueRepeated)
+    protected function getCellXML(Cell $cell, $styleIndex, $numTimesValueRepeated)
     {
         $data = '<table:table-cell table:style-name="ce' . $styleIndex . '"';
 
@@ -156,13 +165,6 @@ class WorksheetManager implements WorksheetManagerInterface
             $data .= ' table:number-columns-repeated="' . $numTimesValueRepeated . '"';
         }
 
-        /** @TODO Remove code duplication with XLSX writer: https://github.com/box/spout/pull/383#discussion_r113292746 */
-        if ($cellValue instanceof Cell) {
-            $cell = $cellValue;
-        } else {
-            $cell = new Cell($cellValue);
-        }
-
         if ($cell->isString()) {
             $data .= ' office:value-type="string" calcext:value-type="string">';
 
diff --git a/src/Spout/Writer/WriterAbstract.php b/src/Spout/Writer/WriterAbstract.php
index 7569ff2..ecba0db 100644
--- a/src/Spout/Writer/WriterAbstract.php
+++ b/src/Spout/Writer/WriterAbstract.php
@@ -7,7 +7,9 @@ use Box\Spout\Common\Exception\IOException;
 use Box\Spout\Common\Exception\SpoutException;
 use Box\Spout\Common\Helper\FileSystemHelper;
 use Box\Spout\Common\Helper\GlobalFunctionsHelper;
+use Box\Spout\Writer\Common\Entity\Cell;
 use Box\Spout\Writer\Common\Entity\Options;
+use Box\Spout\Writer\Common\Entity\Row;
 use Box\Spout\Writer\Common\Entity\Style\Style;
 use Box\Spout\Writer\Common\Manager\OptionsManagerInterface;
 use Box\Spout\Writer\Common\Manager\Style\StyleMerger;
@@ -40,9 +42,6 @@ abstract class WriterAbstract implements WriterInterface
     /** @var StyleMerger Helps merge styles together */
     protected $styleMerger;
 
-    /** @var Style Style to be applied to the next written row(s) */
-    protected $rowStyle;
-
     /** @var string Content-Type value for the header - to be defined by child class */
     protected static $headerContentType;
 
@@ -59,8 +58,6 @@ abstract class WriterAbstract implements WriterInterface
         $this->optionsManager = $optionsManager;
         $this->styleMerger = $styleMerger;
         $this->globalFunctionsHelper = $globalFunctionsHelper;
-
-        $this->resetRowStyleToDefault();
     }
 
     /**
@@ -72,14 +69,12 @@ abstract class WriterAbstract implements WriterInterface
     abstract protected function openWriter();
 
     /**
-     * Adds data to the currently openned writer.
+     * Adds a row to the currently opened writer.
      *
-     * @param  array $dataRow Array containing data to be streamed.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @param Style $style Style to be applied to the written row
+     * @param Row $row The row containing cells and styles
      * @return void
      */
-    abstract protected function addRowToWriter(array $dataRow, $style);
+    abstract protected function addRowToWriter(Row $row);
 
     /**
      * Closes the streamer, preventing any additional writing.
@@ -99,7 +94,6 @@ abstract class WriterAbstract implements WriterInterface
     public function setDefaultRowStyle($defaultStyle)
     {
         $this->optionsManager->setOption(Options::DEFAULT_ROW_STYLE, $defaultStyle);
-        $this->resetRowStyleToDefault();
         return $this;
     }
 
@@ -199,27 +193,37 @@ abstract class WriterAbstract implements WriterInterface
     /**
      * Write given data to the output. New data will be appended to end of stream.
      *
-     * @param  array $dataRow Array containing data to be streamed.
-     *                        If empty, no data is added (i.e. not even as a blank row)
-     *                        Example: $dataRow = ['data1', 1234, null, '', 'data5', false];
+     * @param array|\Box\Spout\Writer\Common\Entity\Row $row The row to be appended to the stream
+     * @return WriterInterface
+     * @internal param array $row Array containing data to be streamed.
+     *          Example $row= ['data1', 1234, null, '', 'data5'];
+     * @internal param \Box\Spout\Writer\Common\Entity\Row $row A Row object with cells and styles
+     *          Example $row = (new Row())->addCell('data1');
+     *
+     * @throws SpoutException If anything else goes wrong while writing data
+     * @throws WriterNotOpenedException If this function is called before opening the writer
+     *
      * @api
-     * @return WriterAbstract
-     * @throws \Box\Spout\Writer\Exception\WriterNotOpenedException If this function is called before opening the writer
-     * @throws \Box\Spout\Common\Exception\IOException If unable to write data
-     * @throws \Box\Spout\Common\Exception\SpoutException If anything else goes wrong while writing data
      */
-    public function addRow(array $dataRow)
+    public function addRow($row)
     {
+        if (!is_array($row) && !$row instanceof Row) {
+            throw new InvalidArgumentException('addRow accepts an array with scalar values or a Row object');
+        }
+
+        if (is_array($row) && !empty($row)) {
+            $row = $this->createRowFromArray($row, null);
+        }
+
         if ($this->isWriterOpened) {
-            // empty $dataRow should not add an empty line
-            if (!empty($dataRow)) {
+            if (!empty($row)) {
                 try {
-                    $this->addRowToWriter($dataRow, $this->rowStyle);
+                    $this->applyDefaultRowStyle($row);
+                    $this->addRowToWriter($row);
                 } catch (SpoutException $e) {
                     // if an exception occurs while writing data,
                     // close the writer and remove all files created so far.
                     $this->closeAndAttemptToCleanupAllFiles();
-
                     // re-throw the exception to alert developers of the error
                     throw $e;
                 }
@@ -227,35 +231,72 @@ abstract class WriterAbstract implements WriterInterface
         } else {
             throw new WriterNotOpenedException('The writer needs to be opened before adding row.');
         }
-
         return $this;
     }
 
+    /**
+     * @inheritdoc
+     *
+     * @api
+     */
+    public function withRow(\Closure $callback)
+    {
+        return $this->addRow($callback(new Row()));
+    }
+
     /**
      * Write given data to the output and apply the given style.
      * @see addRow
      *
-     * @api
-     * @param array $dataRow Array of array containing data to be streamed.
+     * @param array|\Box\Spout\Writer\Common\Entity\Row $row The row to be appended to the stream
      * @param Style $style Style to be applied to the row.
-     * @return WriterAbstract
-     * @throws \Box\Spout\Common\Exception\InvalidArgumentException If the input param is not valid
-     * @throws \Box\Spout\Writer\Exception\WriterNotOpenedException If this function is called before opening the writer
-     * @throws \Box\Spout\Common\Exception\IOException If unable to write data
+     * @return WriterInterface
+     * @internal param array $row Array containing data to be streamed.
+     *          Example $row= ['data1', 1234, null, '', 'data5'];
+     * @internal param \Box\Spout\Writer\Common\Entity\Row $row A Row object with cells and styles
+     *          Example $row = (new Row())->addCell('data1');
+     * @api
+     * @throws InvalidArgumentException If the input param is not valid
      */
-    public function addRowWithStyle(array $dataRow, $style)
+    public function addRowWithStyle($row, $style)
     {
+        if (!is_array($row) && !$row instanceof Row) {
+            throw new InvalidArgumentException('addRowWithStyle accepts an array with scalar values or a Row object');
+        }
+
         if (!$style instanceof Style) {
             throw new InvalidArgumentException('The "$style" argument must be a Style instance and cannot be NULL.');
         }
 
-        $this->setRowStyle($style);
-        $this->addRow($dataRow);
-        $this->resetRowStyleToDefault();
+        if (is_array($row)) {
+            $row = $this->createRowFromArray($row, $style);
+        }
 
+        $this->addRow($row);
         return $this;
     }
 
+    /**
+     * @param array $dataRows
+     * @param Style|null $style
+     * @return Row
+     */
+    protected function createRowFromArray(array $dataRows, Style $style = null)
+    {
+        $row = (new Row())->setCells(array_map(function ($value) {
+            if ($value instanceof Cell) {
+                return $value;
+            }
+            return new Cell($value);
+        }, $dataRows));
+
+        if ($style !== null) {
+            $row->setStyle($style);
+        }
+
+        return $row;
+    }
+
     /**
      * Write given data to the output. New data will be appended to end of stream.
      *
@@ -275,15 +316,13 @@ abstract class WriterAbstract implements WriterInterface
     {
         if (!empty($dataRows)) {
             $firstRow = reset($dataRows);
-            if (!is_array($firstRow)) {
-                throw new InvalidArgumentException('The input should be an array of arrays');
+            if (!is_array($firstRow) && !$firstRow instanceof Row) {
+                throw new InvalidArgumentException('The input should be an array of arrays or row objects');
             }
-
             foreach ($dataRows as $dataRow) {
                 $this->addRow($dataRow);
             }
         }
-
         return $this;
     }
 
@@ -305,35 +344,32 @@ abstract class WriterAbstract implements WriterInterface
             throw new InvalidArgumentException('The "$style" argument must be a Style instance and cannot be NULL.');
         }
 
-        $this->setRowStyle($style);
-        $this->addRows($dataRows);
-        $this->resetRowStyleToDefault();
+        $this->addRows(array_map(function ($row) use ($style) {
+            if (is_array($row)) {
+                return $this->createRowFromArray($row, $style);
+            } elseif ($row instanceof Row) {
+                return $row;
+            } else {
+                throw new InvalidArgumentException();
+            }
+        }, $dataRows));
 
         return $this;
     }
 
     /**
-     * Sets the style to be applied to the next written rows
-     * until it is changed or reset.
-     *
-     * @param Style $style
-     * @return void
+     * @param Row $row
+     * @return $this
      */
-    private function setRowStyle($style)
+    private function applyDefaultRowStyle(Row $row)
     {
-        // Merge given style with the default one to inherit custom properties
         $defaultRowStyle = $this->optionsManager->getOption(Options::DEFAULT_ROW_STYLE);
-        $this->rowStyle = $this->styleMerger->merge($style, $defaultRowStyle);
-    }
-
-    /**
-     * Resets the style to be applied to the next written rows.
-     *
-     * @return void
-     */
-    private function resetRowStyleToDefault()
-    {
-        $this->rowStyle = $this->optionsManager->getOption(Options::DEFAULT_ROW_STYLE);
+        if (null === $defaultRowStyle) {
+            return $this;
+        }
+        $merged = $this->styleMerger->merge($row->getStyle(), $defaultRowStyle);
+        $row->setStyle($merged);
+        return $this;
     }
 
     /**
diff --git a/src/Spout/Writer/WriterInterface.php b/src/Spout/Writer/WriterInterface.php
index d9dee14..4b8c6c6 100644
--- a/src/Spout/Writer/WriterInterface.php
+++ b/src/Spout/Writer/WriterInterface.php
@@ -34,26 +34,38 @@ interface WriterInterface
     /**
      * Write given data to the output. New data will be appended to end of stream.
      *
-     * @param  array $dataRow Array containing data to be streamed.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
+     * @param array|\Box\Spout\Writer\Common\Entity\Row $row The row to be appended to the stream
      * @return WriterInterface
-     * @throws \Box\Spout\Writer\Exception\WriterNotOpenedException If the writer has not been opened yetthe writer
-     * @throws \Box\Spout\Common\Exception\IOException If unable to write data
+     * @internal param array $row Array containing data to be streamed.
+     *          Example $row= ['data1', 1234, null, '', 'data5'];
+     * @internal param \Box\Spout\Writer\Common\Entity\Row $row A Row object with cells and styles
+     *          Example $row = (new Row())->addCell('data1');
      */
-    public function addRow(array $dataRow);
+    public function addRow($row);
 
     /**
      * Write given data to the output and apply the given style.
      * @see addRow
      *
-     * @param array $dataRow Array of array containing data to be streamed.
+     * @param array|\Box\Spout\Writer\Common\Entity\Row $row The row to be appended to the stream
      * @param Style $style Style to be applied to the row.
      * @return WriterInterface
-     * @throws \Box\Spout\Common\Exception\InvalidArgumentException If the input param is not valid
-     * @throws \Box\Spout\Writer\Exception\WriterNotOpenedException If this function is called before opening the writer
-     * @throws \Box\Spout\Common\Exception\IOException If unable to write data
+     * @internal param array $row Array containing data to be streamed.
+     *          Example $row= ['data1', 1234, null, '', 'data5'];
+     * @internal param \Box\Spout\Writer\Common\Entity\Row $row A Row object with cells and styles
+     *          Example $row = (new Row())->addCell('data1');
      */
-    public function addRowWithStyle(array $dataRow, $style);
+    public function addRowWithStyle($row, $style);
+
+    /**
+     * Write given data to the output with a closure funtion. New data will be appended to end of stream.
+     *
+     * @param \Closure $callback A callback returning a Row object. A new Row object is injected into the callback.
+     * @return WriterInterface
+     * @internal param \Closure $callback
+     *          Example withRow(function(Row $row) { return $row->addCell('data1'); })
+     */
+    public function withRow(\Closure $callback);
 
     /**
      * Write given data to the output. New data will be appended to end of stream.
diff --git a/src/Spout/Writer/WriterMultiSheetsAbstract.php b/src/Spout/Writer/WriterMultiSheetsAbstract.php
index f76a150..67917db 100644
--- a/src/Spout/Writer/WriterMultiSheetsAbstract.php
+++ b/src/Spout/Writer/WriterMultiSheetsAbstract.php
@@ -6,6 +6,7 @@ use Box\Spout\Common\Helper\GlobalFunctionsHelper;
 use Box\Spout\Writer\Common\Entity\Sheet;
 use Box\Spout\Writer\Common\Manager\OptionsManagerInterface;
 use Box\Spout\Writer\Common\Entity\Options;
+use Box\Spout\Writer\Common\Entity\Row;
 use Box\Spout\Writer\Common\Entity\Worksheet;
 use Box\Spout\Writer\Common\Manager\Style\StyleMerger;
 use Box\Spout\Writer\Exception\SheetNotFoundException;
@@ -159,17 +160,15 @@ abstract class WriterMultiSheetsAbstract extends WriterAbstract
      * If shouldCreateNewSheetsAutomatically option is set to true, it will handle pagination
      * with the creation of new worksheets if one worksheet has reached its maximum capicity.
      *
-     * @param array $dataRow Array containing data to be written.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @param \Box\Spout\Writer\Common\Entity\Style\Style $style Style to be applied to the row.
+     * @param Row $row
      * @return void
      * @throws WriterNotOpenedException If the book is not created yet
      * @throws \Box\Spout\Common\Exception\IOException If unable to write data
      */
-    protected function addRowToWriter(array $dataRow, $style)
+    protected function addRowToWriter(Row $row)
     {
         $this->throwIfWorkbookIsNotAvailable();
-        $this->workbookManager->addRowToCurrentWorksheet($dataRow, $style);
+        $this->workbookManager->addRowToCurrentWorksheet($row);
     }
 
     /**
diff --git a/src/Spout/Writer/XLSX/Manager/WorksheetManager.php b/src/Spout/Writer/XLSX/Manager/WorksheetManager.php
index 6a03dad..73f908f 100644
--- a/src/Spout/Writer/XLSX/Manager/WorksheetManager.php
+++ b/src/Spout/Writer/XLSX/Manager/WorksheetManager.php
@@ -9,9 +9,9 @@ use Box\Spout\Writer\Common\Helper\CellHelper;
 use Box\Spout\Writer\Common\Manager\OptionsManagerInterface;
 use Box\Spout\Writer\Common\Entity\Options;
 use Box\Spout\Writer\Common\Entity\Cell;
+use Box\Spout\Writer\Common\Entity\Row;
 use Box\Spout\Writer\Common\Entity\Worksheet;
 use Box\Spout\Writer\Common\Manager\WorksheetManagerInterface;
-use Box\Spout\Writer\Common\Entity\Style\Style;
 use Box\Spout\Writer\XLSX\Manager\Style\StyleManager;
 
 /**
@@ -115,60 +115,47 @@ EOD;
     }
 
     /**
-     * Adds data to the given worksheet.
+     * Adds a row to the worksheet.
      *
      * @param Worksheet $worksheet The worksheet to add the row to
-     * @param array $dataRow Array containing data to be written. Cannot be empty.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @param Style $rowStyle Style to be applied to the row. NULL means use default style.
+     * @param Row $row The row to be added
      * @return void
      * @throws IOException If the data cannot be written
      * @throws InvalidArgumentException If a cell value's type is not supported
      */
-    public function addRow(Worksheet $worksheet, $dataRow, $rowStyle)
+    public function addRow(Worksheet $worksheet, Row $row)
     {
-        if (!$this->isEmptyRow($dataRow)) {
-            $this->addNonEmptyRow($worksheet, $dataRow, $rowStyle);
+        if (!$row->isEmpty()) {
+            $this->addNonEmptyRow($worksheet, $row);
         }
 
         $worksheet->setLastWrittenRowIndex($worksheet->getLastWrittenRowIndex() + 1);
     }
 
-    /**
-     * Returns whether the given row is empty
-     *
-     * @param array $dataRow Array containing data to be written. Cannot be empty.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @return bool Whether the given row is empty
-     */
-    private function isEmptyRow($dataRow)
-    {
-        $numCells = count($dataRow);
-        // using "reset()" instead of "$dataRow[0]" because $dataRow can be an associative array
-        return ($numCells === 1 && CellHelper::isEmpty(reset($dataRow)));
-    }
-
     /**
      * Adds non empty row to the worksheet.
      *
-     * @param Worksheet $worksheet The worksheet to add the row to
-     * @param array $dataRow Array containing data to be written. Cannot be empty.
-     *          Example $dataRow = ['data1', 1234, null, '', 'data5'];
-     * @param \Box\Spout\Writer\Common\Entity\Style\Style $style Style to be applied to the row. NULL means use default style.
+     * @param Row $row The row to be written
      * @return void
+     *
      * @throws \Box\Spout\Common\Exception\IOException If the data cannot be written
      * @throws \Box\Spout\Common\Exception\InvalidArgumentException If a cell value's type is not supported
      */
-    private function addNonEmptyRow(Worksheet $worksheet, $dataRow, $style)
+    private function addNonEmptyRow(Worksheet $worksheet, Row $row)
     {
         $cellNumber = 0;
         $rowIndex = $worksheet->getLastWrittenRowIndex() + 1;
-        $numCells = count($dataRow);
+        $numCells = count($row->getCells());
 
         $rowXML = '<row r="' . $rowIndex . '" spans="1:' . $numCells . '">';
 
-        foreach($dataRow as $cellValue) {
-            $rowXML .= $this->getCellXML($rowIndex, $cellNumber, $cellValue, $style->getId());
+        /** @var Cell $cell */
+        foreach($row->getCells() as $cell) {
+            // Apply styles - the row style is merged at this point
+            $cell->applyStyle($row->getStyle());
+            $this->styleManager->applyExtraStylesIfNeeded($cell);
+            $registeredStyle = $this->styleManager->registerStyle($cell->getStyle());
+            $rowXML .= $this->getCellXML($rowIndex, $cellNumber, $cell, $registeredStyle->getId());
             $cellNumber++;
         }
 
@@ -185,24 +172,17 @@ EOD;
      *
      * @param int $rowIndex
      * @param int $cellNumber
-     * @param mixed $cellValue
+     * @param Cell $cell
      * @param int $styleId
      * @return string
      * @throws InvalidArgumentException If the given value cannot be processed
      */
-    private function getCellXML($rowIndex, $cellNumber, $cellValue, $styleId)
+    private function getCellXML($rowIndex, $cellNumber, Cell $cell, $styleId)
     {
         $columnIndex = CellHelper::getCellIndexFromColumnIndex($cellNumber);
         $cellXML = '<c r="' . $columnIndex . $rowIndex . '"';
         $cellXML .= ' s="' . $styleId . '"';
 
-        /** @TODO Remove code duplication with ODS writer: https://github.com/box/spout/pull/383#discussion_r113292746 */
-        if ($cellValue instanceof Cell) {
-            $cell = $cellValue;
-        } else {
-            $cell = new Cell($cellValue);
-        }
-
         if ($cell->isString()) {
             $cellXML .= $this->getCellXMLFragmentForNonEmptyString($cell->getValue());
         } else if ($cell->isBoolean()) {
diff --git a/tests/Spout/Writer/Common/Entity/RowTest.php b/tests/Spout/Writer/Common/Entity/RowTest.php
index 3f6304d..6018191 100644
--- a/tests/Spout/Writer/Common/Entity/RowTest.php
+++ b/tests/Spout/Writer/Common/Entity/RowTest.php
@@ -29,12 +29,6 @@ class RowTest extends TestCase
         $this->assertInstanceOf('Box\Spout\Writer\Common\Entity\Row', new Row([$this->cellMock()->getMock()]));
     }
 
-    public function testInvalidInstanceCellType()
-    {
-        $this->expectException('TypeError');
-        $this->assertInstanceOf('Box\Spout\Writer\Common\Entity\Row', new Row(['string']));
-    }
-
     public function testSetCells()
     {
         $o = new Row();
diff --git a/tests/Spout/Writer/Common/Manager/Style/StyleManagerTest.php b/tests/Spout/Writer/Common/Manager/Style/StyleManagerTest.php
index ea2b1f6..2978087 100644
--- a/tests/Spout/Writer/Common/Manager/Style/StyleManagerTest.php
+++ b/tests/Spout/Writer/Common/Manager/Style/StyleManagerTest.php
@@ -3,6 +3,7 @@
 namespace Box\Spout\Writer\Common\Manager\Style;
 
 use Box\Spout\Writer\Common\Creator\Style\StyleBuilder;
+use Box\Spout\Writer\Common\Entity\Cell;
 
 /**
  * Class StyleManagerTest
@@ -31,7 +32,7 @@ class StyleManagerTest extends \PHPUnit_Framework_TestCase
         $this->assertFalse($style->shouldWrapText());
 
         $styleManager = $this->getStyleManager();
-        $updatedStyle = $styleManager->applyExtraStylesIfNeeded($style, [12, 'single line', "multi\nlines", null]);
+        $updatedStyle = $styleManager->applyExtraStylesIfNeeded(new Cell("multi\nlines", $style));
 
         $this->assertTrue($updatedStyle->shouldWrapText());
     }
@@ -45,7 +46,7 @@ class StyleManagerTest extends \PHPUnit_Framework_TestCase
         $this->assertTrue($style->shouldWrapText());
 
         $styleManager = $this->getStyleManager();
-        $updatedStyle = $styleManager->applyExtraStylesIfNeeded($style, ["multi\nlines"]);
+        $updatedStyle = $styleManager->applyExtraStylesIfNeeded(new Cell("multi\nlines"));
 
         $this->assertTrue($updatedStyle->shouldWrapText());
     }