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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 |
|---|---|---|---|---|---|---|---|---|---|
| Bryce O'Bryan | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Artie O'Connor | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Nick O'Keefe | 1981-1984 | .244 | 5 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Andy O'Neil | 1989-1990 | .000 | 0 | 0 | 1 | 1 | 0 | 2.96 | 10 |
| Donnie O'Neil | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Justin O'Reilly | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Randy O'Reilly | 1988-1990 | .148 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bruce O'Rourke | 1986-1990 | .207 | 2 | 23 | 44 | 48 | 0 | 4.22 | 466 |
| Ben Oglethorpe | 1981-1981 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Oglethorpe Jr. | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Oliva | 1981-1984 | .174 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Brad Oliver | 1989-1990 | .195 | 0 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Millard Orr | 1981-1988 | .193 | 0 | 11 | 25 | 49 | 1 | 5.74 | 342 |
| Tom Orr | 1981-1989 | .182 | 0 | 6 | 18 | 22 | 4 | 5.49 | 303 |
| Augusto Ortega | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Ortega | 1983-1990 | .254 | 60 | 216 | 0 | 0 | 0 | 0.00 | 0 |
| William Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Osborne | 1989-1990 | .282 | 4 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Júlio Otero | 1981-1983 | .279 | 17 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Owens | 1985-1988 | .000 | 0 | 0 | 0 | 1 | 0 | 4.70 | 15 |
| Hunter Owens | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
