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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 |
|---|---|---|---|---|---|---|---|---|---|
| Nick O'Keefe | 1981-1984 | .244 | 5 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Justin O'Reilly | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Randy O'Reilly | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bruce O'Rourke | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Francis O'Sullivan | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Oglethorpe | 1981-1981 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Oliva | 1981-1984 | .174 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Millard Orr | 1981-1985 | .223 | 0 | 11 | 21 | 32 | 1 | 5.38 | 233 |
| Tom Orr | 1981-1985 | .233 | 0 | 5 | 12 | 14 | 3 | 4.82 | 204 |
| Sergio Ortega | 1983-1985 | .221 | 9 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Júlio Otero | 1981-1983 | .279 | 17 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Owens | 1985-1985 | .000 | 0 | 0 | 0 | 0 | 0 | 3.38 | 3 |
| Hunter Owens | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
