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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 |
|---|---|---|---|---|---|---|---|---|---|
| Flemming O'Neill | 2023-2023 | .203 | 2 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Héctor Ocampo | 2020-2020 | .000 | 0 | 0 | 2 | 1 | 0 | 3.56 | 18 |
| 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 | 2022-2023 | .000 | 0 | 0 | 9 | 4 | 1 | 2.49 | 121 |
| 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 |
| 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 | 2022-2023 | .000 | 0 | 0 | 15 | 13 | 0 | 3.08 | 257 |
| José Osorio | 2022-2023 | .253 | 0 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Otero | 2023-2023 | .000 | 0 | 0 | 3 | 5 | 10 | 4.50 | 49 |
| Bill Oulton | 2020-2020 | .000 | 0 | 0 | 6 | 1 | 0 | 2.23 | 67 |
