Mordecai “Three Fingered” Brown, 1908.
Brown was a pitcher for the Chicago Cubs. Per his nickname, he really only had three fingers: his index finger was a stump that was the result of catching his hand in a corn shredder when he was seven-years-old. That accident gave Brown an odd spin on his fastball which confounded hitters. He won 239 games while losing only 130 in his career. His ERA was 2.06, the third lowest in history for pitchers with over 2,000 innings.
In the 1908 World Series Brown was one of two star pitchers, winning two games against the Detroit Tigers. Brown was elected to the Baseball Hall of Fame in 1949.