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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 |
| Gary O'Herlihy | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 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 |
| 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 |
| Juan Ordóńez | 2024-2024 | .000 | 0 | 0 | 7 | 6 | 0 | 3.70 | 89 |
| Germán Orozco | 2021-2023 | .000 | 0 | 0 | 5 | 0 | 5 | 3.08 | 32 |
| David Ortega | 2020-2022 | .250 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| 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 |
| José Ortíz | 2023-2024 | .000 | 0 | 0 | 13 | 18 | 0 | 2.96 | 226 |
| Martin Ortíz | 2021-2023 | .000 | 0 | 0 | 0 | 0 | 2 | 6.46 | 9 |
| 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 |
| Juan Otero | 2020-2020 | .329 | 2 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Odemar Ouweneel | 2022-2022 | .000 | 0 | 0 | 5 | 2 | 2 | 3.35 | 42 |
| Jian-gang Ow-Yang | 2024-2024 | .000 | 0 | 0 | 2 | 0 | 1 | 3.98 | 23 |
| Mike Owens | 2024-2024 | .000 | 0 | 0 | 5 | 7 | 0 | 2.82 | 99 |
