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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chi-hun O | 2020-2023 | 0 | 2 | .000 | 3.18 | 13 | 1 | 0 | 0 | 0 | 34.0 | 40 | 12 | 1 | 15 | 8 |
| Gary O'Herlihy | 2023-2023 | 0 | 0 | .000 | 6.75 | 2 | 0 | 0 | 0 | 0 | 1.1 | 3 | 1 | 0 | 0 | 0 |
| Will O'Slattery | 2022-2023 | 7 | 10 | .412 | 3.52 | 45 | 14 | 1 | 0 | 15 | 127.2 | 133 | 50 | 4 | 42 | 107 |
| Ralph Ogstoun | 2022-2022 | 0 | 0 | .000 | 0.90 | 4 | 0 | 0 | 0 | 0 | 10.0 | 11 | 1 | 0 | 1 | 5 |
| Álex Olivarez | 2021-2023 | 0 | 0 | .000 | 4.76 | 4 | 0 | 0 | 0 | 0 | 5.2 | 5 | 3 | 0 | 2 | 2 |
| Robert Olson | 2022-2023 | 0 | 1 | .000 | 3.52 | 11 | 0 | 0 | 0 | 0 | 15.1 | 16 | 6 | 0 | 3 | 10 |
| Juan Ordóńez | 2024-2024 | 7 | 6 | .538 | 3.70 | 19 | 19 | 0 | 0 | 0 | 119.1 | 132 | 49 | 3 | 42 | 89 |
| Germán Orozco | 2021-2023 | 5 | 0 | 1.000 | 3.08 | 20 | 0 | 0 | 0 | 5 | 38.0 | 40 | 13 | 2 | 17 | 32 |
| Cisco Ortíz | 2024-2024 | 10 | 3 | .769 | 2.14 | 17 | 17 | 0 | 0 | 0 | 122.0 | 97 | 29 | 3 | 23 | 137 |
| José Ortíz | 2023-2024 | 13 | 18 | .419 | 2.96 | 43 | 43 | 10 | 2 | 0 | 295.0 | 266 | 97 | 7 | 109 | 226 |
| Martin Ortíz | 2021-2023 | 0 | 0 | .000 | 6.46 | 9 | 1 | 0 | 0 | 2 | 15.1 | 17 | 11 | 3 | 9 | 9 |
| Odemar Ouweneel | 2022-2022 | 5 | 2 | .714 | 3.35 | 23 | 0 | 0 | 0 | 2 | 37.2 | 33 | 14 | 2 | 18 | 42 |
| Jian-gang Ow-Yang | 2024-2024 | 2 | 0 | 1.000 | 3.98 | 18 | 0 | 0 | 0 | 1 | 31.2 | 32 | 14 | 1 | 14 | 23 |
| Mike Owens | 2024-2024 | 5 | 7 | .417 | 2.82 | 16 | 16 | 0 | 0 | 0 | 99.0 | 79 | 31 | 3 | 35 | 99 |
