Bill Mueller
Tony Cloninger is the only pitcher to have accomplished the feat. Bill Mueller hit his grand slams from both sides of the plate, while Jim Northrup hit his grand slams on consecutive pitches received in the fifth and sixth innings. Nomar Garciaparra is the sole player to achieve the feat at home, doing so at Fenway Park for the Boston Red Sox. Cloninger is the only player who never hit a grand slam before or after his milestone game, while Robin Ventura—with 18 grand slams—hit more than any other player in this group. Frank Robinson is also a member of the 500 home run club.