Now You Know

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