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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Robert O'Connor | 2018-2018 | 0 | 1 | .000 | 67.50 | 1 | 1 | 0 | 0 | 0 | 0.2 | 3 | 5 | 1 | 4 | 2 |
| Carl O'Malloy | 2016-2019 | 3 | 5 | .375 | 5.37 | 86 | 0 | 0 | 0 | 2 | 110.2 | 119 | 66 | 18 | 42 | 125 |
| Aaron O'Neill | 2017-2022 | 4 | 3 | .571 | 4.48 | 35 | 8 | 0 | 0 | 0 | 72.1 | 88 | 36 | 3 | 34 | 40 |
| Ron O'Slattery | 2022-2024 | 3 | 5 | .375 | 4.19 | 9 | 9 | 0 | 0 | 0 | 53.2 | 50 | 25 | 5 | 24 | 26 |
| Alin Oanta | 2020-2024 | 23 | 22 | .511 | 3.91 | 75 | 75 | 2 | 0 | 0 | 412.1 | 370 | 179 | 30 | 209 | 370 |
| Floyd Oglethorpe | 2015-2016 | 5 | 13 | .278 | 7.70 | 55 | 30 | 0 | 0 | 0 | 145.0 | 223 | 124 | 28 | 82 | 119 |
| Taro Ohayashi | 2022-2022 | 3 | 5 | .375 | 3.93 | 8 | 8 | 0 | 0 | 0 | 50.1 | 45 | 22 | 2 | 31 | 27 |
| Jesús Olvero | 2020-2020 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 1.2 | 0 | 0 | 0 | 1 | 2 |
| Eduardo Ortega | 2016-2016 | 0 | 0 | .000 | 7.36 | 5 | 0 | 0 | 0 | 0 | 7.1 | 12 | 6 | 1 | 4 | 7 |
| Alberto Ortíz | 2017-2017 | 1 | 7 | .125 | 4.98 | 44 | 0 | 0 | 0 | 21 | 43.1 | 52 | 24 | 4 | 24 | 39 |
| Carlos Ortíz | 2022-2022 | 4 | 8 | .333 | 8.28 | 18 | 15 | 0 | 0 | 0 | 79.1 | 115 | 73 | 9 | 57 | 45 |
| Luis Ortíz | 2016-2016 | 3 | 0 | 1.000 | 7.99 | 21 | 0 | 0 | 0 | 1 | 32.2 | 37 | 29 | 8 | 21 | 24 |
| Reynaldo Ortíz | 2020-2021 | 6 | 11 | .353 | 4.14 | 23 | 23 | 1 | 0 | 0 | 145.2 | 129 | 67 | 6 | 83 | 114 |
| Andrew Osborne | 2017-2017 | 1 | 3 | .250 | 7.47 | 14 | 14 | 0 | 0 | 0 | 59.0 | 100 | 49 | 13 | 22 | 34 |
| Bill Oulton | 2021-2021 | 1 | 2 | .333 | 6.12 | 4 | 4 | 0 | 0 | 0 | 25.0 | 22 | 17 | 4 | 18 | 23 |
