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Most grand slam home runs in a game

Most grand slam home runs in a game
Who
Josh Willingham
Where
United States
When
27 July 2009
The Major League Baseball (MLB) record for most grand slam home runs hit in a game is 2 by 13 players, most recently Josh Willingham (USA) playing for the Washington Nationals (USA) against the Milwaukee Brewers (USA) on 27 July 2009.