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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 | 1991-1992 | 0 | 1 | .000 | 13.03 | 16 | 0 | 0 | 0 | 1 | 19.1 | 33 | 28 | 4 | 16 | 23 |
| Andy O'Neil | 1989-1992 | 10 | 6 | .625 | 3.93 | 138 | 0 | 0 | 0 | 19 | 169.2 | 148 | 74 | 6 | 94 | 121 |
| Martin O'Neill | 1991-1992 | 0 | 0 | .000 | 4.91 | 3 | 0 | 0 | 0 | 0 | 3.2 | 4 | 2 | 1 | 1 | 3 |
| Bruce O'Rourke | 1986-1992 | 64 | 69 | .481 | 4.21 | 181 | 181 | 3 | 1 | 0 | 1076.1 | 1123 | 503 | 125 | 325 | 663 |
| 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 |
