On May 20, 1918, Indians outfielder Tris Speaker was hit in the head by a pitch thrown by Red Sox hurler Carl Mays. A right-handed submarine pitcher, Mays denied Speaker’s allegation that the beanball pitch was intentional. Mays pitched a complete game, winning 11-1 that day. The beanball would prove a precursor to the pitch that would kill Ray Chapman two years later.
Carl Mays (SABR)