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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 |
|---|---|---|---|---|---|---|---|---|---|
| Bruce O'Slattery | 2018-2018 | .000 | 0 | 0 | 1 | 3 | 0 | 6.64 | 15 |
| Steven O'Toole | 2022-2022 | .269 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Nathan Oats | 2021-2021 | .207 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Ogden | 2017-2017 | .292 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Orozco | 2018-2019 | .226 | 5 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 4.76 | 10 |
| José Ortega | 2018-2018 | .191 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Ortíz | 2017-2017 | .000 | 0 | 0 | 0 | 0 | 5 | 4.30 | 17 |
| Bubba Osborn | 2019-2019 | .231 | 2 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Tyson Oswalt | 2019-2019 | .000 | 0 | 0 | 0 | 1 | 0 | 2.45 | 25 |
| Miguel Otero | 2018-2018 | .207 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Bryan Owen | 2019-2019 | .000 | 0 | 0 | 2 | 1 | 0 | 7.16 | 18 |
| Jared Owens | 2023-2023 | .250 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Richard Owens | 2017-2017 | .000 | 0 | 0 | 0 | 1 | 0 | 1.00 | 4 |
