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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| John O'Day | 2024-2025 | .244 | 14 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Denny O'Dugan | 2025-2025 | .000 | 0 | 0 | 0 | 1 | 2 | 13.50 | 11 |
| Anderson O'Mara | 2024-2025 | .000 | 0 | 0 | 7 | 14 | 0 | 3.74 | 84 |
| Flemming O'Neill | 2023-2024 | .216 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Héctor Ocampo | 2020-2020 | .000 | 0 | 0 | 2 | 1 | 0 | 3.56 | 18 |
| Luis Ochoa | 2025-2025 | .000 | 0 | 0 | 3 | 2 | 6 | 2.27 | 40 |
| Piotr Oja | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 2 | 0.00 | 7 |
| Noriaki Okada | 2022-2022 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Lawrence Olsen | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| José Olvera | 2025-2025 | .281 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Octávio Ontiveros | 2025-2025 | .213 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Ciprian Oprita | 2023-2023 | .000 | 0 | 0 | 0 | 1 | 0 | 8.44 | 3 |
| Hugo Ordiales | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 3.51 | 28 |
| Juan Ordóńez | 2022-2022 | .000 | 0 | 0 | 5 | 3 | 1 | 4.79 | 47 |
| Francisco Ornelas | 2021-2021 | .209 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortega | 2022-2025 | .000 | 0 | 0 | 20 | 14 | 1 | 2.75 | 329 |
| José Ortega | 2020-2021 | .263 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Ortega | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortíz | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 0 | 1.42 | 7 |
| Jesús Ortíz | 2024-2025 | .310 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| José Antonio Ortíz | 2024-2024 | .296 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortíz | 2021-2021 | .000 | 0 | 0 | 1 | 0 | 0 | 1.04 | 11 |
| Tony Ortíz | 2025-2025 | .000 | 0 | 0 | 1 | 0 | 0 | 0.87 | 7 |
| Vincente Ortíz | 2020-2021 | .000 | 0 | 0 | 4 | 3 | 15 | 3.96 | 21 |
| John Orton | 2022-2025 | .000 | 0 | 0 | 23 | 27 | 3 | 3.38 | 417 |
| José Osorio | 2022-2023 | .253 | 0 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Otero | 2023-2025 | .000 | 0 | 0 | 11 | 21 | 10 | 4.28 | 206 |
| Bill Oulton | 2020-2020 | .000 | 0 | 0 | 6 | 1 | 0 | 2.23 | 67 |
