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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Carl O'Malloy | -1-2017 | 0 | 1 | .000 | 6.33 | 54 | 0 | 0 | 0 | 1 | 58.1 | 69 | 41 | 18 | 26 | 42 |
| Aaron O'Neill | 0-2017 | 5 | 11 | .312 | 5.17 | 44 | 25 | 0 | 0 | 0 | 155.0 | 167 | 89 | 23 | 65 | 97 |
| Ron O'Slattery | 0-2021 | 4 | 2 | .667 | 6.26 | 20 | 10 | 0 | 0 | 0 | 83.1 | 99 | 58 | 14 | 38 | 61 |
| Jake O'Tomalty | 1-2026 | 1 | 2 | .333 | 3.81 | 51 | 0 | 0 | 0 | 4 | 52.0 | 39 | 22 | 5 | 29 | 50 |
| Alin Oanta | 0-2023 | 0 | 0 | .000 | 8.10 | 8 | 0 | 0 | 0 | 0 | 10.0 | 13 | 9 | 0 | 12 | 10 |
| Jesús Olvero | 0-2026 | 0 | 3 | .000 | 6.25 | 84 | 0 | 0 | 0 | 7 | 72.0 | 91 | 50 | 9 | 35 | 57 |
| Ramón Ortega | 4-2026 | 11 | 19 | .367 | 3.81 | 41 | 41 | 4 | 1 | 0 | 272.0 | 230 | 115 | 30 | 83 | 264 |
| Roberto Ortega | 6-2020 | 21 | 14 | .600 | 2.71 | 46 | 46 | 1 | 0 | 0 | 305.0 | 263 | 92 | 33 | 29 | 304 |
| Alberto Ortíz | 0-0 | 11 | 8 | .579 | 4.70 | 194 | 0 | 0 | 0 | 1 | 249.0 | 228 | 130 | 36 | 115 | 215 |
| José Ortíz | 0-2026 | 3 | 3 | .500 | 5.19 | 27 | 0 | 0 | 0 | 1 | 43.1 | 44 | 25 | 5 | 24 | 23 |
| Pedro Ortíz | 0-2026 | 6 | 7 | .462 | 3.39 | 24 | 24 | 1 | 0 | 0 | 132.2 | 127 | 50 | 9 | 34 | 81 |
| Vincente Ortíz | 0-2026 | 1 | 3 | .250 | 4.14 | 40 | 0 | 0 | 0 | 1 | 37.0 | 35 | 17 | 1 | 19 | 22 |
| Bill Oulton | 0-2026 | 7 | 6 | .538 | 3.25 | 20 | 17 | 3 | 2 | 0 | 133.0 | 103 | 48 | 11 | 70 | 103 |
