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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 | 1991-1995 | 30 | 33 | .476 | 4.48 | 101 | 80 | 0 | 0 | 1 | 494.1 | 493 | 246 | 53 | 164 | 364 |
| Bill O'Clancy | 1994-1995 | 16 | 22 | .421 | 3.91 | 53 | 45 | 1 | 1 | 0 | 289.2 | 277 | 126 | 26 | 128 | 234 |
| Andy O'Neil | 1989-1995 | 17 | 17 | .500 | 3.72 | 169 | 30 | 0 | 0 | 19 | 338.1 | 291 | 140 | 15 | 155 | 231 |
| Jeremy O'Neil | 1993-1995 | 4 | 2 | .667 | 2.57 | 83 | 0 | 0 | 0 | 2 | 70.0 | 73 | 20 | 5 | 18 | 43 |
| Martin O'Neill | 1991-1995 | 1 | 2 | .333 | 4.68 | 10 | 4 | 0 | 0 | 0 | 25.0 | 28 | 13 | 3 | 5 | 11 |
| Bruce O'Rourke | 1986-1995 | 85 | 95 | .472 | 4.31 | 299 | 231 | 3 | 1 | 7 | 1432.1 | 1512 | 686 | 160 | 462 | 865 |
| Rodrigo Olvera | 1995-1995 | 0 | 0 | .000 | 27.03 | 3 | 0 | 0 | 0 | 0 | 0.1 | 1 | 1 | 0 | 1 | 1 |
| 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 |
