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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 | 1991-1998 | 53 | 74 | .417 | 4.39 | 191 | 169 | 2 | 1 | 1 | 1047.0 | 1048 | 511 | 126 | 315 | 765 |
| Bill O'Clancy | 1994-1998 | 52 | 51 | .505 | 3.09 | 136 | 128 | 6 | 3 | 0 | 832.0 | 743 | 286 | 58 | 268 | 683 |
| Joe O'Keefe | 1996-1998 | 0 | 0 | .000 | 11.57 | 3 | 0 | 0 | 0 | 0 | 4.2 | 7 | 6 | 1 | 2 | 2 |
| Andy O'Neil | 1989-1998 | 21 | 20 | .512 | 3.64 | 258 | 30 | 0 | 0 | 21 | 440.1 | 383 | 178 | 23 | 203 | 296 |
| Jeremy O'Neil | 1993-1998 | 15 | 16 | .484 | 3.00 | 263 | 0 | 0 | 0 | 40 | 230.2 | 225 | 77 | 19 | 68 | 184 |
| 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 | 1986-1998 | 100 | 105 | .488 | 4.34 | 478 | 231 | 3 | 1 | 8 | 1639.1 | 1740 | 790 | 186 | 534 | 985 |
| Rodrigo Olvera | 1995-1998 | 12 | 8 | .600 | 4.74 | 117 | 0 | 0 | 0 | 2 | 114.0 | 106 | 60 | 13 | 55 | 91 |
| 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 |
