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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 | 2024-2024 | .257 | 4 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Anderson O'Mara | 2024-2024 | .000 | 0 | 0 | 6 | 11 | 0 | 4.57 | 55 |
| 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 | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| 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 |
| Ciprian Oprita | 2023-2023 | .000 | 0 | 0 | 0 | 1 | 0 | 8.44 | 3 |
| 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 | 2022-2024 | .000 | 0 | 0 | 12 | 7 | 1 | 2.73 | 169 |
| 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 | 2024-2024 | .333 | 0 | 0 | 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 |
| Vincente Ortíz | 2020-2021 | .000 | 0 | 0 | 4 | 3 | 15 | 3.96 | 21 |
| John Orton | 2022-2024 | .000 | 0 | 0 | 17 | 25 | 0 | 3.70 | 339 |
| José Osorio | 2022-2023 | .253 | 0 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Otero | 2023-2024 | .000 | 0 | 0 | 10 | 12 | 10 | 4.32 | 142 |
| Bill Oulton | 2020-2020 | .000 | 0 | 0 | 6 | 1 | 0 | 2.23 | 67 |
