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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 | 2013-2022 | 112 | 55 | .671 | 3.09 | 215 | 215 | 33 | 11 | 0 | 1532.1 | 1257 | 526 | 153 | 425 | 1520 |
| Roberto Ortega | 2020-2020 | 8 | 10 | .444 | 3.26 | 27 | 27 | 3 | 0 | 0 | 190.2 | 190 | 69 | 11 | 31 | 132 |
| Pedro Ortíz | 2020-2022 | 15 | 9 | .625 | 3.10 | 48 | 28 | 0 | 0 | 2 | 200.1 | 177 | 69 | 9 | 92 | 179 |
| Bill Oulton | 2022-2022 | 6 | 5 | .545 | 3.36 | 18 | 17 | 1 | 0 | 0 | 112.1 | 92 | 42 | 8 | 58 | 98 |
