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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 | 1991-1994 | 20 | 19 | .513 | 4.65 | 70 | 49 | 0 | 0 | 1 | 311.1 | 317 | 161 | 31 | 114 | 231 |
| Bill O'Clancy | 1994-1994 | 5 | 4 | .556 | 2.93 | 21 | 13 | 1 | 1 | 0 | 98.1 | 91 | 32 | 9 | 38 | 71 |
| Andy O'Neil | 1989-1994 | 17 | 17 | .500 | 3.73 | 168 | 30 | 0 | 0 | 19 | 338.0 | 291 | 140 | 15 | 155 | 231 |
| Jeremy O'Neil | 1993-1994 | 2 | 1 | .667 | 1.67 | 28 | 0 | 0 | 0 | 0 | 27.0 | 22 | 5 | 1 | 5 | 13 |
| Martin O'Neill | 1991-1994 | 1 | 2 | .333 | 5.01 | 8 | 4 | 0 | 0 | 0 | 23.1 | 27 | 13 | 3 | 4 | 11 |
| Bruce O'Rourke | 1986-1994 | 79 | 89 | .470 | 4.27 | 231 | 231 | 3 | 1 | 0 | 1379.2 | 1451 | 654 | 150 | 439 | 836 |
| 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 |
