On May 24, 1936, Yankees second baseman Tony Lazzeri became the first player in major league history to hit two grand slams in a single game. Even more astonishing, Lazzeri went on to hit a third home run in the game, en route to establishing an American League record of 11 RBIs in a single contest. The Yankees soundly defeated the Philadelphia Athletics, 25-2.
Tony Lazzeri (City of Toronto Archives)