Grand slam records — including most grand slams in a career, most grand slams in a single season, most grand slams in a game, and several position specific grand slam records. Research by Baseball Almanac.
"He (former Major League career grand slam leader Lou Gehrig) just went out and did his job every day." - Hall of Famer Bill Dickey in Baseball Digest (June 1992, Glenn Liebman, 'Here's What Hall of Famers Say About Each Other', Page 62)
One of the rarest events in baseball is HITTING TWO GRAND SLAMS IN THE SAME GAME BY THE SAME PLAYER and they are all listed (along with box scores, positional breakdowns, and trivia items) in our fabulous feats section.
* Royce Lewis tied the major league record for grand slams in a single season by a rookie (four in 2023), as listed above, but he also hit one on May 13, 2022, his first year in the majors, giving him five total while in rookie status.
On May 26, 1929, New York Giants pinch-hitter Pat Crawford hit a grand slam. Les Bell, from the Boston Braves, pinch-hit and also hit a grand slam. This is the only time in history two pinch-hitters have each hit a grand slam during the same game.
Jim Northrup in 1968, and Larry Parrish in 1982, are the only players in Major League history to hit three grand slams during the same calendar week. However, did you know that Lou Gehrig once hit three grand slams over a four day period in 1931 (August 29, August 31 & September 1)? By comparison it took Northrup six days in 1968, and Parrish seven days in 1982.