プレイヤーズ・リーグ
O'Neill followed Charlie Comiskey to the Players' League in 1890, appearing in 137 games as an outfielder for Comiskey's Chicago Pirates. He hit .302 in the Players' League with a .377 on-base percentage. He led the league in games played and ranked second with 647 plate appearances and seventh with 174 hits and 244 times on base.