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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 | 1991-1996 | 37 | 50 | .425 | 4.59 | 133 | 112 | 0 | 0 | 1 | 688.1 | 690 | 351 | 83 | 214 | 499 |
| Bill O'Clancy | 1994-1996 | 27 | 36 | .429 | 3.69 | 86 | 78 | 3 | 1 | 0 | 493.1 | 459 | 202 | 39 | 201 | 386 |
| Joe O'Keefe | 1996-1996 | 0 | 0 | .000 | 27.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 2 | 3 | 0 | 1 | 0 |
| Andy O'Neil | 1989-1996 | 20 | 20 | .500 | 3.74 | 214 | 30 | 0 | 0 | 21 | 385.0 | 336 | 160 | 19 | 176 | 257 |
| Jeremy O'Neil | 1993-1996 | 9 | 9 | .500 | 2.88 | 143 | 0 | 0 | 0 | 22 | 128.0 | 131 | 41 | 8 | 37 | 92 |
| 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 | 1986-1996 | 88 | 99 | .471 | 4.34 | 356 | 231 | 3 | 1 | 8 | 1487.0 | 1582 | 717 | 172 | 480 | 893 |
| Rodrigo Olvera | 1995-1996 | 2 | 1 | .667 | 5.66 | 41 | 0 | 0 | 0 | 0 | 41.1 | 43 | 26 | 2 | 31 | 26 |
| 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 |
