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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 | 1991-1996 | .207 | 0 | 7 | 37 | 50 | 1 | 4.59 | 499 |
| Bill O'Clancy | 1994-1996 | .178 | 0 | 13 | 27 | 36 | 0 | 3.69 | 386 |
| Artie O'Connor | 1991-1995 | .194 | 2 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Jason O'Kearney | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Keefe | 1996-1996 | .000 | 0 | 0 | 0 | 0 | 0 | 27.00 | 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 | 1989-1996 | .207 | 0 | 3 | 20 | 20 | 21 | 3.74 | 257 |
| Donnie O'Neil | 1991-1996 | .189 | 6 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy O'Neil | 1993-1996 | 1.000 | 0 | 2 | 9 | 9 | 22 | 2.88 | 92 |
| Martin O'Neill | 1991-1996 | .000 | 0 | 1 | 1 | 2 | 0 | 4.66 | 12 |
| Spencer O'Neill | 1991-1996 | .227 | 17 | 120 | 0 | 0 | 0 | 0.00 | 0 |
| Randy O'Reilly | 1988-1992 | .256 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bruce O'Rourke | 1986-1996 | .196 | 3 | 31 | 88 | 99 | 8 | 4.34 | 893 |
| Ben Oglethorpe | 1981-1981 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Oglethorpe | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Oglethorpe Jr. | 1991-1995 | .217 | 1 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Oliva | 1981-1984 | .174 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Brad Oliver | 1989-1996 | .237 | 27 | 296 | 0 | 0 | 0 | 0.00 | 0 |
| Rodrigo Olvera | 1995-1996 | .000 | 0 | 0 | 2 | 1 | 0 | 5.66 | 26 |
| Alfonso Orozco | 0-0 | .000 | 0 | 0 | 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 | 1983-1996 | .241 | 75 | 300 | 0 | 0 | 0 | 0.00 | 0 |
| Felipe Ortíz | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| William Ortíz | 1991-1996 | .268 | 28 | 118 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Osborne | 1989-1996 | .240 | 38 | 166 | 0 | 0 | 0 | 0.00 | 0 |
| Júlio Otero | 1981-1983 | .279 | 17 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Owens | 1985-1994 | .000 | 0 | 0 | 0 | 1 | 0 | 4.50 | 18 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Hunter Owens | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Keith Owens | 1996-1996 | .000 | 0 | 0 | 0 | 2 | 0 | 31.16 | 2 |
