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.
On September 20, 2013, A-Rod hit his record 24th career grand slam against the San Francisco Giants at Yankee Stadium. He had been tied with Lou Gehrig with 23 grand slams since June 12, 2012. It was the 14th time that he had hit a grand slam in a Yankees uniform.
two grand slams
Lou Gehrig with 23
Jorge Posada hit grand slams on Saturday, June 12 and Sunday, June 13 against the Houston Astros during interleague play.
Andre ethier has hit 2 grand slams so far
6 Grand Slams = Don Mattingly(1987New YorkYankees),Travis Hafner(2006 Cleveland Indians)
Barry Bonds hit eleven grand slams during his career.