List of Major League Baseball single-game grand slam leaders

In baseball, a grand slam is a home run that is hit when the bases are loaded (i.e., there are runners occupying first, second, and third base simultaneously), thereby scoring four runs—the most possible in one play. Thirteen players have hit two grand slams in a single Major League Baseball (MLB) game to date, the most recent being Josh Willingham of the Washington Nationals on July 27, 2009.

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