Bill Childress

William M. Childress (1867–1940) was an American professional baseball player who pitched in one game for the Louisville Colonels of the National League on July 27, 1895. He allowed two hits, walked five, threw three wild pitches, and allowed six runs to score—all without recording an out. As this was his only major league appearance, he is credited with an infinite career earned run average, and is the first such player who exclusively played as a pitcher. Provided by Wikipedia