1) Tony Lazzeri of the New York Yankees on May 24, 1936.
2) Frank Robinson of the Baltimore Orioles on June 26, 1970.
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Only one pitcher has managed to hit two grand slams in one game. Tony Cloninger, then of the Atlanta Braves, managed this feat in a game against San Francisco in 1966.
Yes, in AUG 6th, 1986, the Rangers and the Orioles did it.
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In 2011, the Yankees hit ten grand slams. They were hit by Robinson Cano (3), Mark Teixeira (2), Jorge Posada (1), Alex Rodriguez (1), Curtis Granderson (1), Russell Martin (1) and Francisco Cervelli (1).
Tony Cloninger hit two grandslams on July 3, 1966 against the San Francisco Giants.
Unfortunately, the most recent data I could find was for the 2008 MLB season. In 2008, 124 grand slams were hit (72 in the AL and 52 in the NL) in 2428 total games for an average of 1 grand slam every 19.58 games. The most grand slams hit in an MLB season is 176 (89 in the AL and 87 in the NL) in 2429 games in the 2000 season for an average of 1 grand slam every 13.80 games.