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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 | 2020-2020 | .000 | 0 | 0 | 0 | 2 | 0 | 3.21 | 8 |
| Will O'Slattery | 2022-2022 | .000 | 0 | 0 | 1 | 3 | 15 | 3.58 | 29 |
| Dale O'Sullivan | 2020-2020 | .204 | 2 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Oglander | 2022-2022 | .238 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Ralph Ogstoun | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.90 | 5 |
| Álex Olivarez | 2021-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Robert Olson | 2022-2022 | .000 | 0 | 0 | 0 | 1 | 0 | 3.24 | 6 |
| Germán Orozco | 2021-2022 | .000 | 0 | 0 | 5 | 0 | 5 | 3.34 | 30 |
| David Ortega | 2020-2022 | .250 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortíz | 2022-2022 | .175 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Martin Ortíz | 2021-2022 | .000 | 0 | 0 | 0 | 0 | 2 | 10.12 | 5 |
| Sergio Ortíz | 2020-2020 | .250 | 4 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Ortíz | 2021-2022 | .244 | 5 | 28 | 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 |
