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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 | 1991-1993 | .156 | 0 | 0 | 10 | 11 | 1 | 5.09 | 127 |
| Bill O'Clancy | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Artie O'Connor | 1991-1993 | .189 | 0 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Nick O'Keefe | 1981-1984 | .244 | 5 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Roy O'Mullowney | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Andy O'Neil | 1989-1993 | .194 | 0 | 2 | 12 | 16 | 19 | 4.09 | 185 |
| Donnie O'Neil | 1991-1993 | .194 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy O'Neil | 1993-1993 | .000 | 0 | 0 | 0 | 1 | 0 | 3.00 | 1 |
| Martin O'Neill | 1991-1993 | .000 | 0 | 0 | 0 | 0 | 0 | 3.86 | 3 |
| Spencer O'Neill | 1991-1993 | .231 | 4 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Randy O'Reilly | 1988-1992 | .256 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bruce O'Rourke | 1986-1993 | .202 | 3 | 29 | 74 | 77 | 0 | 4.28 | 758 |
| Ben Oglethorpe | 1981-1981 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Oglethorpe Jr. | 1991-1993 | .232 | 1 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Oliva | 1981-1984 | .174 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Brad Oliver | 1989-1993 | .219 | 8 | 113 | 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 | 1983-1993 | .244 | 68 | 265 | 0 | 0 | 0 | 0.00 | 0 |
| William Ortíz | 1991-1993 | .259 | 9 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Osborne | 1989-1993 | .241 | 33 | 142 | 0 | 0 | 0 | 0.00 | 0 |
| Júlio Otero | 1981-1983 | .279 | 17 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Owens | 1985-1991 | .000 | 0 | 0 | 0 | 1 | 0 | 4.85 | 17 |
| Hunter Owens | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Keith Owens | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
