In MLB, the career record for grand slams hit by a pitcher is 2 and has been done by 6 pitchers:
Dizzy Trout, Camilo Pascual, Bob Gibson, Tony Cloninger, Rick Wise, and Denny Neagle.
Cloninger hit both of his grand slams in the same game.
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There are 4 runs in a grand slam because of the 3 people on the bases and the one who hit the ball.. :)
09/22/2008 Jason Marquis
07/20/1998 Kevin Tapani
09/16/1972 Burt Hooten
08/28/1937 Clay Bryant
Through the 2008 season in MLB, that is Lou Gehrig with 23 career grand slams.
Nolan Ryan gave up 10 grand slams during his career to hold the MLB record.
Lou Gehrig struck out 790 times during his career.
Robin Ventura hit 18 grand slam home runs in his career which ties him for fifth place on the all-time MLB list. Only Alex Rodriguez (25), Lou Gehrig (23), Manny Ramirez (21) and Eddie Murray (19) hit more grand slams. Ventura is tied with Willie McCovey, whose 18 grand slams were the most ever in National League history.
Lou Gehrig, who played first base for the New York Yankees between 1923-1939, holds the all time MLB grand slam record with 23. Alex Rodriguez tied Lou Gehrig's Record of 23 Grand Slams on June 12th 2012. Alex Rodriguez broke the record in 2013, with his 24th Grand Slam.