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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 | 1991-1991 | 0 | 0 | .000 | 16.50 | 6 | 0 | 0 | 0 | 0 | 6.0 | 12 | 11 | 2 | 5 | 10 |
| Andy O'Neil | 1989-1991 | 7 | 4 | .636 | 4.36 | 72 | 0 | 0 | 0 | 2 | 95.0 | 94 | 46 | 3 | 53 | 63 |
| Martin O'Neill | 1991-1991 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 1 | 0 | 0 | 0 | 1 |
| Bruce O'Rourke | 1986-1991 | 53 | 62 | .461 | 4.27 | 156 | 156 | 3 | 1 | 0 | 918.1 | 962 | 436 | 108 | 281 | 560 |
| 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 | 1985-1991 | 0 | 1 | .000 | 4.85 | 14 | 2 | 0 | 0 | 0 | 26.0 | 36 | 14 | 1 | 16 | 17 |
