Fifty-one years ago today, Atlanta Braves pitcher Tony Cloninger hit two grand slams in the same game, a 17-3 win over the San Francisco Giants. Cloninger is one of 13 players in major league history to hit multiple slams in a game, but the only pitcher to do so. The nine RBIs are also a single-game record for a pitcher.
Cloninger had five of his 11 career home runs in 1966 and also nearly tripled his next-best output with 23 RBIs that season. He had roughly enough career at-bats for a full season and hit .