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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bryce O'Bryan | 1991-1997 | 46 | 64 | .418 | 4.37 | 164 | 143 | 2 | 1 | 1 | 890.1 | 881 | 432 | 103 | 275 | 648 |
| Bill O'Clancy | 1994-1997 | 34 | 42 | .447 | 3.47 | 105 | 97 | 3 | 1 | 0 | 614.1 | 567 | 237 | 49 | 239 | 488 |
| Joe O'Keefe | 1996-1997 | 0 | 0 | .000 | 18.00 | 2 | 0 | 0 | 0 | 0 | 3.0 | 6 | 6 | 1 | 2 | 1 |
| Andy O'Neil | 1989-1997 | 20 | 20 | .500 | 3.59 | 230 | 30 | 0 | 0 | 21 | 408.1 | 348 | 163 | 20 | 185 | 272 |
| Jeremy O'Neil | 1993-1997 | 13 | 10 | .565 | 2.73 | 208 | 0 | 0 | 0 | 26 | 187.2 | 176 | 57 | 13 | 51 | 145 |
| Martin O'Neill | 1991-1996 | 1 | 2 | .333 | 4.66 | 12 | 4 | 0 | 0 | 0 | 29.0 | 34 | 15 | 3 | 7 | 12 |
| Bruce O'Rourke | 1986-1997 | 95 | 103 | .480 | 4.34 | 429 | 231 | 3 | 1 | 8 | 1584.2 | 1680 | 764 | 178 | 512 | 952 |
| Rodrigo Olvera | 1995-1997 | 12 | 6 | .667 | 4.53 | 110 | 0 | 0 | 0 | 2 | 109.1 | 99 | 55 | 12 | 53 | 89 |
| Millard Orr | 1981-1988 | 25 | 49 | .338 | 5.74 | 227 | 89 | 2 | 0 | 1 | 655.0 | 808 | 418 | 92 | 256 | 342 |
| Tom Orr | 1981-1989 | 18 | 22 | .450 | 5.49 | 280 | 44 | 0 | 0 | 4 | 498.2 | 569 | 304 | 58 | 283 | 303 |
| Bill Owens | 1985-1994 | 0 | 1 | .000 | 4.50 | 16 | 2 | 0 | 0 | 0 | 30.0 | 39 | 15 | 1 | 20 | 18 |
| Keith Owens | 1996-1996 | 0 | 2 | .000 | 31.16 | 2 | 2 | 0 | 0 | 0 | 4.1 | 14 | 15 | 1 | 10 | 2 |
