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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Denny O'Dugan | 0-2025 | 0 | 1 | .000 | 13.50 | 6 | 0 | 0 | 0 | 2 | 9.1 | 17 | 14 | 2 | 9 | 11 |
| Anderson O'Mara | 0-2025 | 7 | 14 | .333 | 3.74 | 32 | 32 | 0 | 0 | 0 | 158.2 | 168 | 66 | 3 | 49 | 84 |
| Héctor Ocampo | 0-2020 | 2 | 1 | .667 | 3.56 | 4 | 4 | 1 | 0 | 0 | 30.1 | 36 | 12 | 0 | 9 | 18 |
| Luis Ochoa | 0-2025 | 3 | 2 | .600 | 2.27 | 27 | 0 | 0 | 0 | 6 | 35.2 | 24 | 9 | 1 | 18 | 40 |
| Piotr Oja | 0-4 | 0 | 0 | .000 | 0.00 | 6 | 0 | 0 | 0 | 2 | 4.2 | 4 | 0 | 0 | 0 | 7 |
| Ciprian Oprita | 0-2023 | 0 | 1 | .000 | 8.44 | 5 | 0 | 0 | 0 | 0 | 5.1 | 9 | 5 | 0 | 5 | 3 |
| Hugo Ordiales | 0-2025 | 0 | 0 | .000 | 3.51 | 11 | 0 | 0 | 0 | 0 | 25.2 | 21 | 10 | 2 | 10 | 28 |
| Juan Ordóńez | 0-2025 | 5 | 3 | .625 | 4.79 | 32 | 1 | 0 | 0 | 1 | 62.0 | 78 | 33 | 2 | 38 | 47 |
| Carlos Ortega | 3-2023 | 20 | 14 | .588 | 2.75 | 47 | 44 | 0 | 0 | 1 | 298.1 | 249 | 91 | 13 | 100 | 329 |
| Carlos Ortíz | 0-2020 | 1 | 0 | 1.000 | 1.42 | 1 | 1 | 0 | 0 | 0 | 6.1 | 7 | 1 | 0 | 2 | 7 |
| Luis Ortíz | 0-2021 | 1 | 0 | 1.000 | 1.04 | 1 | 1 | 0 | 0 | 0 | 8.2 | 5 | 1 | 0 | 0 | 11 |
| Tony Ortíz | 0-4 | 1 | 0 | 1.000 | 0.87 | 3 | 0 | 0 | 0 | 0 | 10.1 | 10 | 1 | 0 | 5 | 7 |
| Vincente Ortíz | 0-2021 | 4 | 3 | .571 | 3.96 | 43 | 0 | 0 | 0 | 15 | 38.2 | 39 | 17 | 1 | 20 | 21 |
| John Orton | 4-4 | 23 | 27 | .460 | 3.38 | 87 | 57 | 2 | 0 | 3 | 420.2 | 390 | 158 | 21 | 168 | 417 |
| Jesús Otero | 0-2025 | 11 | 21 | .344 | 4.28 | 69 | 50 | 0 | 0 | 10 | 279.2 | 324 | 133 | 18 | 111 | 206 |
| Bill Oulton | 0-2020 | 6 | 1 | .857 | 2.23 | 8 | 8 | 2 | 0 | 0 | 64.2 | 48 | 16 | 3 | 14 | 67 |
