Fernando Tatís became the only player to hit two grand slams in the same inning, when he attained the milestone, slugging two in the third inning for the St. Louis Cardinals on April 23, 1999. In achieving the feat, he also set a new major league record with eight runs batted in in a single inning. Thirteen players have hit two grand slams in a single Major League Baseball (MLB) game to date. No player has accomplished the feat more than once in his career and no player has ever hit more than two in a game.