Pitchers Hitting Feats Mike Cuellar becomes the first pitcher to homer in a league championship game October 3, 1970May 4, 2019 Pitchers Hitting Feats On October 3, 1970 Baltimore’s Mike Cuellar becomes the first pitcher to homer in a league championship game. The right-hander’s fourth-inning grand slam proves to be the difference in the Orioles’ 10-6 ALCS Game 1 victory over Minnesota.