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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Brian O'Brian | 2016-2016 | 1 | 0 | 1.000 | 15.00 | 1 | 0 | 0 | 0 | 0 | 3.0 | 7 | 5 | 0 | 1 | 0 |
| Paul O'Callahan | 2021-2022 | 0 | 0 | .000 | 7.31 | 16 | 0 | 0 | 0 | 1 | 28.1 | 36 | 23 | 5 | 17 | 13 |
| Ron O'Slattery | 2020-2021 | 1 | 1 | .500 | 9.58 | 4 | 1 | 0 | 0 | 0 | 10.1 | 20 | 11 | 0 | 1 | 4 |
| Alin Oanta | 2021-2022 | 8 | 9 | .471 | 4.95 | 35 | 16 | 0 | 0 | 1 | 100.0 | 97 | 55 | 14 | 51 | 68 |
| Jesús Olvero | 2021-2022 | 2 | 7 | .222 | 4.23 | 58 | 0 | 0 | 0 | 12 | 78.2 | 71 | 37 | 7 | 49 | 59 |
| Ramón Ortega | 2013-2024 | 115 | 57 | .669 | 3.10 | 222 | 222 | 33 | 11 | 0 | 1583.2 | 1303 | 545 | 156 | 447 | 1565 |
| Roberto Ortega | 2020-2020 | 8 | 10 | .444 | 3.26 | 27 | 27 | 3 | 0 | 0 | 190.2 | 190 | 69 | 11 | 31 | 132 |
| Pedro Ortíz | 2020-2024 | 29 | 21 | .580 | 3.37 | 82 | 62 | 3 | 0 | 2 | 409.0 | 366 | 153 | 24 | 156 | 332 |
| Vincente Ortíz | 2023-2023 | 0 | 4 | .000 | 7.88 | 35 | 0 | 0 | 0 | 0 | 53.2 | 68 | 47 | 4 | 45 | 19 |
| Bill Oulton | 2022-2024 | 30 | 15 | .667 | 3.06 | 64 | 63 | 2 | 0 | 0 | 418.0 | 352 | 142 | 29 | 196 | 340 |
