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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Marc O'Brian | 2016-2017 | 6 | 4 | .600 | 4.61 | 21 | 21 | 0 | 0 | 0 | 109.1 | 110 | 56 | 14 | 48 | 115 |
| Josh Oakman | 2017-2017 | 2 | 1 | .667 | 3.69 | 12 | 12 | 0 | 0 | 0 | 63.1 | 62 | 26 | 7 | 13 | 58 |
| Adam Obermeier | 2019-2019 | 0 | 3 | .000 | 5.04 | 11 | 11 | 0 | 0 | 0 | 55.1 | 55 | 31 | 11 | 24 | 61 |
| Will Olejnik | 2020-2020 | 2 | 2 | .500 | 5.27 | 20 | 0 | 0 | 0 | 7 | 27.1 | 29 | 16 | 4 | 8 | 26 |
| Manuel Olivera | 2020-2020 | 4 | 2 | .667 | 6.13 | 11 | 11 | 0 | 0 | 0 | 47.0 | 68 | 32 | 6 | 18 | 44 |
| Bruce Oney | 2020-2020 | 2 | 3 | .400 | 9.19 | 25 | 0 | 0 | 0 | 0 | 32.1 | 43 | 33 | 9 | 27 | 32 |
| Tatsuya Oshima | 2022-2023 | 4 | 4 | .500 | 6.69 | 34 | 0 | 0 | 0 | 5 | 36.1 | 55 | 27 | 3 | 18 | 22 |
| Tyler Ovens | 2020-2020 | 3 | 0 | 1.000 | 4.56 | 19 | 0 | 0 | 0 | 0 | 25.2 | 31 | 13 | 1 | 7 | 19 |
| Mike Overstreet | 2020-2021 | 3 | 2 | .600 | 3.83 | 39 | 0 | 0 | 0 | 5 | 49.1 | 45 | 21 | 6 | 19 | 44 |
