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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 |
|---|---|---|---|---|---|---|---|---|---|
| Chi-hun O | 2020-2023 | .000 | 0 | 0 | 0 | 2 | 0 | 3.18 | 8 |
| Gerald O'Collins | 2026-2026 | .143 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Gary O'Herlihy | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 0 |
| William O'Keefe | 2026-2026 | .314 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Will O'Slattery | 2022-2023 | .000 | 0 | 0 | 7 | 10 | 15 | 3.52 | 107 |
| Dale O'Sullivan | 2020-2020 | .204 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Emmet Odlum | 2024-2024 | .298 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Oglander | 2022-2023 | .204 | 0 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Ralph Ogstoun | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.90 | 5 |
| Akihiko Oike | 2026-2026 | .333 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Takechi Okubo | 2026-2026 | .229 | 9 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Álex Olivarez | 2021-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 4.76 | 2 |
| Robert Olson | 2022-2023 | .000 | 0 | 0 | 0 | 1 | 0 | 3.52 | 10 |
| Doppo Omikado | 2026-2026 | .000 | 0 | 0 | 6 | 5 | 19 | 2.31 | 83 |
| Tzu-hsia Ong | 2026-2026 | .000 | 0 | 0 | 1 | 2 | 0 | 2.34 | 30 |
| Juan Ordóńez | 2024-2026 | .000 | 0 | 0 | 21 | 21 | 0 | 3.87 | 265 |
| José Orihvela | 2026-2026 | .345 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Aurelio Ornelas | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 2 | 0.00 | 2 |
| Germán Orozco | 2021-2023 | .000 | 0 | 0 | 5 | 0 | 5 | 3.08 | 32 |
| Jesús Orozco | 2025-2025 | .000 | 0 | 0 | 3 | 1 | 2 | 2.28 | 40 |
| Carlos Ortega | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| David Ortega | 2020-2022 | .250 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ortíz | 2026-2026 | .000 | 0 | 0 | 5 | 2 | 0 | 2.01 | 61 |
| Carlos Ortíz | 2026-2026 | .000 | 0 | 0 | 5 | 1 | 0 | 4.83 | 48 |
| Cisco Ortíz | 2024-2024 | .000 | 0 | 0 | 10 | 3 | 0 | 2.14 | 137 |
| Jesús Ortíz | 2022-2023 | .175 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Joaquín Ortíz | 2025-2025 | .000 | 0 | 0 | 0 | 1 | 1 | 8.31 | 3 |
| José Ortíz | 2023-2024 | .000 | 0 | 0 | 13 | 18 | 0 | 2.96 | 226 |
| José Antonio Ortíz | 2026-2026 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Martin Ortíz | 2021-2023 | .000 | 0 | 0 | 0 | 0 | 2 | 6.46 | 9 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Sergio Ortíz | 2020-2020 | .250 | 4 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Ortíz | 2021-2023 | .232 | 7 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Jaime Osorio | 2026-2026 | .000 | 0 | 0 | 1 | 2 | 0 | 6.25 | 16 |
| Juan Otero | 2020-2020 | .329 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Yajirobei Otomo | 2025-2025 | .000 | 0 | 0 | 1 | 2 | 1 | 2.70 | 8 |
| Odemar Ouweneel | 2022-2022 | .000 | 0 | 0 | 5 | 2 | 2 | 3.35 | 42 |
| Jian-gang Ow-Yang | 2024-2026 | .000 | 0 | 0 | 11 | 3 | 5 | 3.05 | 142 |
| Mike Owens | 2024-2024 | .000 | 0 | 0 | 5 | 7 | 0 | 2.82 | 99 |
