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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Paul O'Callahan | 2015-2020 | 1 | 6 | .143 | 8.29 | 28 | 6 | 0 | 0 | 0 | 63.0 | 83 | 58 | 9 | 36 | 48 |
| Robert O'Connor | 2020-2020 | 0 | 0 | .000 | 7.71 | 3 | 3 | 0 | 0 | 0 | 9.1 | 15 | 8 | 0 | 5 | 5 |
| Nathaniel O'Heyne | 2019-2021 | 8 | 13 | .381 | 4.56 | 45 | 28 | 2 | 0 | 0 | 201.1 | 222 | 102 | 19 | 113 | 103 |
| Aaron O'Neill | 2016-2019 | 7 | 7 | .500 | 5.70 | 92 | 17 | 2 | 1 | 1 | 170.2 | 228 | 108 | 17 | 97 | 91 |
| Ron O'Slattery | 2016-2016 | 9 | 5 | .643 | 3.34 | 22 | 15 | 2 | 1 | 0 | 107.2 | 111 | 40 | 8 | 40 | 89 |
| Jake O'Tomalty | 2017-2021 | 15 | 13 | .536 | 2.56 | 189 | 0 | 0 | 0 | 86 | 200.1 | 136 | 57 | 16 | 103 | 240 |
| Lorenzo Ortega | 2016-2020 | 0 | 2 | .000 | 14.73 | 14 | 0 | 0 | 0 | 0 | 18.1 | 43 | 30 | 4 | 14 | 8 |
| Alberto Ortíz | 2020-2021 | 3 | 8 | .273 | 5.79 | 80 | 0 | 0 | 0 | 1 | 96.1 | 94 | 62 | 14 | 56 | 84 |
| Carlos Ortíz | 2020-2020 | 0 | 4 | .000 | 6.82 | 6 | 5 | 0 | 0 | 0 | 31.2 | 35 | 24 | 3 | 28 | 10 |
