As of the 2008 season, the record is 9 and is held by pitcher Tony Cloninger who hit 2 grand slams in a game against the San Francisco Giants on July 3, 1966.
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In a 7 game World Series that was Bobby Richardson of the 1960 New York Yankees with 12. The Yankees lost that WS to the Pittsburgh Pirates 4 games to 3.
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Through the 2011 season, Albert Pujols of the St. Louis Cardinals has 1,329 career RBIs.
Nine by Tony Cloninger of the Atlanta Braves on July 3, 1966 against the San Francisco Giants. Cloninger hit two grand slams and a single to account for the 9 RBIs.
In MLB, that was 4 against the Philadelphia Athletics on June 3, 1932.