Thirteen players have smashed a pair of slams in one game.
Josh Willingham of the Nationals belted grand slams in the fifth and sixth innings on July 27, 2009.
Bill Mueller of the Red Sox hit slams in the seventh and eighth innings on July 29, 2003.
Red Sox shortstop Nomar Garciaparra belted grand slams in the first and eighth innings on May 10, 1999.
Fernando Tatis of the Cardinals launched both of his grand slams in the third inning on April 23, 1999.
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Orioles catcher Chris Hoiles' slams came in the third and eighth innings on Aug. 14, 1998
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Robin Ventura of the White Sox roped grand slams in the fourth and fifth innings on Sept. 4, 1995.
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Orioles Hall of Famer Frank Robinson crushed grand slams in the fifth and sixth innings on June 26, 1970.
Tigers right fielder Jim Northrup hit slams in the fifth and sixth innings on June 24, 1968.
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Braves pitcher Tony Cloninger was the first hurler to belt grand slams, doing so in the first and fourth innings on July 3, 1966.
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Jim Gentile of the Orioles hit slams in the first and second innings on May 9, 1961.
Red Sox first baseman Rudy York's slams were hit in the second and fifth innings on July 27, 1946.
Jim Tabor (center) of the Boston Red Sox celebrated the Fourth of July in 1939 with grand slams in the third and sixth innings.
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Tony Lazzeri of the Yankees became the first player to hit two grand slams in the same game when he went deep in the second and fifth innings on May 24, 1936.