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Most grand slams in a single season, through 2006. Note: Mattingly never hit another grand slam in his career, which ended in 1995:
* Don Mattingly, New York Yankees...6 (1987)
* Travis Hafner, Cleveland Indians...6 (2006)
* Ernie Banks, Chicago Cubs...5 (1955)
* Jim Gentile, Baltimore Orioles...5 (1961)
Source: World Features Syndicate
