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Through the 2013 season, there were 6452 grand slams hit in baseball history. The most grand slams in a season happened in the year 2000 when 176 grand slams were hit.
Jorge Posada hit grand slams on Saturday, June 12 and Sunday, June 13 against the Houston Astros during interleague play.
For his entire career he hit 6 grand slams and oddly enough they all were hit in 1987.
Andre ethier has hit 2 grand slams so far
Alex Rodriguez hit 3 grand slams during the 2007 season.