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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Dave O'Meara | 1891-1893 | .106 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Danny O'Riordan | 1884-1884 | .218 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| James Oden | 1892-1893 | .186 | 0 | 7 | 19 | 17 | 2 | 5.28 | 128 |
| Ben OLeary | 1886-1893 | .184 | 7 | 78 | 163 | 106 | 3 | 3.73 | 1653 |
| William Olsen | 1892-1892 | .500 | 0 | 0 | 0 | 0 | 0 | 7.36 | 1 |
| Harry Overton | 1893-1893 | .000 | 0 | 0 | 0 | 1 | 0 | 7.27 | 3 |
| William Owens | 1884-1887 | .274 | 12 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Ike Owns | 1891-1893 | .276 | 26 | 157 | 0 | 0 | 0 | 0.00 | 0 |
