Walk-off home run
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In baseball, a walk-off home run is a home run that ends the game. For a home run to end the game, it must be hit in the bottom of the final inning and generate enough runs to exceed the opponent's sc
The Washington Nationals celebrate a walk-off grand slam hit by Justin Maxwell in 2009.
Grand slam (baseball)
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In baseball, a grand slam is a home run hit with all three bases occupied by baserunners, thereby scoring four runs—the most possible in one play. According to The Dickson Baseball Dictionary, the ter
Walk-off home run
…winning runs must still touch all three bases and be counted at home plate. A variant of the walk-off home run, the walk-off grand slam, occurs when a grand slam exceeds the opponent's score in the bottom of the final inning and ends the game. Although the concept of a game-ending home run is as old as baseball…
In 1987, Don Mattingly set the record for most grand slams in a single season, with six. These were the only grand slams of his career.
Fernando Tatís (pictured with the Mets) is the only player to hit two grand slams in the same inning, with the Cardinals, in 1999.
Alex Rodriguez currently holds the record for most career grand slams with 25.
With 23 grand slams, Lou Gehrig held the all-time record until 2013.