Lou Gehrig - 23
In MLB, the Minnesota Twins. Matsui hit his first MLB grand slam on April 8, 2003 off of Joe Mays of the Minnesota Twins. It was his first ever MLB home run.
Not in MLB ... although he did hit his first MLB home run in his 3rd ever at bat ... it was a grand slam.
In MLB between 1954-2010, there were 53 grand slam home runs hit by pitchers, 51 in the regular season and 2 in the post season. During this time frame, 6 pitchers hit 2 grand slams (Camilo Pascual, Tony Cloninger, Dave McNally, Rick Wise, Bob Gibson, Denny Neagle) and 41 have hit 1. Both of Cloninger's slams came in the same game ... one of McNally's two came in the World Series, the only pitcher to hit a grand slam in the World Series ... Neagle gave up a slam to a pitcher (Kevin Tapani).
The MLB pitcher that pitched the most innings without giving up a grand slam was Hall of Famer Jim Palmer of the Baltimore Orioles. He pitched 3948 innings in the regular season and another 124 1/3 innings in the postseason without giving up a grand slam.
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.
Kelly Shopach Cleveland Indians It was a GRand Slam on the third pitch with a 0-2 count
16, all by National League pitchers. Yovani Gallardo of the Milwaukee Brewers led all pitchers in home runs with 4.
Early Wynn Schoolboy Rowe