Leon DayLeon Day (October 30, 1916 - March 13, 1995) was a Negro League baseball player. He was a pitcher for the Baltimore Black Sox, Brooklyn Eagles, Newark Eagles, and the Baltimore Elite Giants.
Day is noted for pitching a perfect season in 1937 (13-0) while playing for the Newark Eagles and for his fastball. Day was also a good hitter and baserunner, batting a .320 in 1937.
From 1935 through 1946 he appeared in a record seven East-West all-star games and set an all-star record by striking-out 14 batters. Also, in 1942 he set a Negro League record when he struck out 18 Baltimore batters in a single game.
When the Negro League was in the off season, Day played winter ball in Puerto Rico. There he established a Puerto Rican record of 19 strikeouts.