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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 |
| Jimmy O'Flahavan | 2028-2028 | .000 | 0 | 0 | 10 | 7 | 0 | 1.90 | 186 |
| Trevor O'Herlihy | 2026-2026 | .361 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Anderson O'Mara | 2024-2025 | .000 | 0 | 0 | 7 | 14 | 0 | 3.74 | 84 |
| Larry O'Morgan | 2026-2027 | .238 | 2 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Flemming O'Neill | 2023-2024 | .216 | 3 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Paul O'Neill | 2026-2026 | .242 | 0 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Marvello Obra | 2028-2029 | .218 | 4 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Héctor Ocampo | 2020-2020 | .000 | 0 | 0 | 2 | 1 | 0 | 3.56 | 18 |
| Luis Ochoa | 2025-2028 | .000 | 0 | 0 | 3 | 3 | 8 | 1.89 | 65 |
| Shigenobu Ohayashi | 2029-2029 | .302 | 8 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Piotr Oja | 2025-2026 | .000 | 0 | 0 | 8 | 7 | 2 | 2.83 | 154 |
| Kazuchika Okada | 2028-2029 | .000 | 0 | 0 | 14 | 9 | 1 | 2.94 | 174 |
| Noriaki Okada | 2022-2022 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Olivo | 2026-2026 | .288 | 1 | 13 | 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 |
| Satoshi Ono | 2029-2029 | .000 | 0 | 0 | 0 | 2 | 0 | 2.35 | 14 |
| Octávio Ontiveros | 2025-2028 | .258 | 4 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Oostermeer | 2029-2029 | .273 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Ciprian Oprita | 2023-2023 | .000 | 0 | 0 | 0 | 1 | 0 | 8.44 | 3 |
| Marcos Oquendo | 2026-2026 | .000 | 0 | 0 | 12 | 5 | 0 | 2.40 | 168 |
| Hugo Ordiales | 2025-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 3.41 | 31 |
| 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 |
| Luis Oropeza | 2027-2029 | .000 | 0 | 0 | 2 | 1 | 6 | 1.32 | 87 |
| Curt Orser | 2029-2029 | .000 | 0 | 0 | 3 | 3 | 1 | 2.21 | 52 |
| Carlos Ortega | 2022-2026 | .000 | 0 | 0 | 21 | 14 | 7 | 2.69 | 370 |
| José Ortega | 2020-2021 | .263 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Leonardo Ortega | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alberto Ortíz | 2026-2028 | .000 | 0 | 0 | 6 | 1 | 4 | 1.36 | 45 |
| 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 |
| Pancho Ortíz | 2026-2027 | .000 | 0 | 0 | 3 | 6 | 1 | 2.96 | 64 |
| 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 |
| Jesús Osorio | 2029-2029 | .235 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| José Osorio | 2022-2023 | .253 | 0 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Osorio | 2026-2028 | .240 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Otero | 2023-2026 | .000 | 0 | 0 | 12 | 21 | 10 | 4.28 | 212 |
| Bill Oulton | 2020-2020 | .000 | 0 | 0 | 6 | 1 | 0 | 2.23 | 67 |
| Rich Overby | 2026-2026 | .000 | 0 | 0 | 1 | 0 | 0 | 2.20 | 17 |
| Giel Overwater | 2029-2029 | .000 | 0 | 0 | 15 | 3 | 0 | 2.22 | 161 |
| Clarence Oveur | 2026-2029 | .000 | 0 | 0 | 10 | 11 | 2 | 4.64 | 146 |
