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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 | 2021-2021 | 0 | 0 | .000 | 6.75 | 8 | 0 | 0 | 0 | 0 | 10.2 | 13 | 8 | 2 | 6 | 3 |
| Ron O'Slattery | 2020-2021 | 1 | 1 | .500 | 9.58 | 4 | 1 | 0 | 0 | 0 | 10.1 | 20 | 11 | 0 | 1 | 4 |
| Alin Oanta | 2021-2021 | 5 | 0 | 1.000 | 3.72 | 19 | 0 | 0 | 0 | 1 | 38.2 | 33 | 16 | 4 | 24 | 27 |
| Jesús Olvero | 2021-2021 | 1 | 1 | .500 | 5.40 | 7 | 0 | 0 | 0 | 0 | 16.2 | 16 | 10 | 4 | 9 | 10 |
| Ramón Ortega | 2013-2021 | 111 | 52 | .681 | 3.04 | 211 | 211 | 33 | 11 | 0 | 1510.0 | 1234 | 510 | 149 | 416 | 1496 |
| Roberto Ortega | 2020-2020 | 8 | 10 | .444 | 3.26 | 27 | 27 | 3 | 0 | 0 | 190.2 | 190 | 69 | 11 | 31 | 132 |
| Pedro Ortíz | 2020-2021 | 7 | 6 | .538 | 3.88 | 31 | 11 | 0 | 0 | 2 | 92.2 | 91 | 40 | 3 | 48 | 90 |
