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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Homer O'Lannigan | 2022-2022 | 9 | 7 | .562 | 3.52 | 22 | 22 | 0 | 0 | 0 | 140.2 | 127 | 55 | 12 | 47 | 94 |
| Carl O'Malloy | 2015-2016 | 2 | 4 | .333 | 5.21 | 36 | 0 | 0 | 0 | 1 | 48.1 | 47 | 28 | 11 | 19 | 48 |
| Aaron O'Neill | 2015-2015 | 3 | 0 | 1.000 | 3.57 | 12 | 0 | 0 | 0 | 1 | 22.2 | 25 | 9 | 0 | 12 | 29 |
| Chris O'Toole | 2021-2022 | 1 | 2 | .333 | 3.24 | 16 | 2 | 0 | 0 | 0 | 16.2 | 21 | 6 | 1 | 5 | 12 |
| Taro Ohayashi | 2021-2022 | 9 | 5 | .643 | 2.77 | 27 | 20 | 1 | 0 | 1 | 130.0 | 107 | 40 | 10 | 67 | 91 |
| Luis Oliva | 2016-2021 | 2 | 5 | .286 | 5.59 | 68 | 0 | 0 | 0 | 1 | 75.2 | 97 | 47 | 9 | 32 | 59 |
| Ramón Oliveira | 2020-2020 | 0 | 0 | .000 | 3.68 | 3 | 0 | 0 | 0 | 3 | 7.1 | 5 | 3 | 2 | 3 | 4 |
| Jesús Olvero | 2020-2020 | 1 | 0 | 1.000 | 0.87 | 10 | 0 | 0 | 0 | 6 | 10.1 | 3 | 1 | 0 | 3 | 11 |
| Eduardo Ortega | 2016-2017 | 1 | 0 | 1.000 | 5.53 | 21 | 0 | 0 | 0 | 0 | 27.2 | 33 | 17 | 3 | 26 | 21 |
| Alberto Ortíz | 2015-2015 | 0 | 0 | .000 | 2.61 | 11 | 0 | 0 | 0 | 0 | 10.1 | 14 | 3 | 0 | 6 | 8 |
| José Ortíz | 2022-2022 | 4 | 3 | .571 | 3.66 | 39 | 0 | 0 | 0 | 22 | 46.2 | 38 | 19 | 3 | 21 | 47 |
| Luis Ortíz | 2020-2020 | 0 | 0 | .000 | 7.89 | 5 | 3 | 0 | 0 | 0 | 21.2 | 27 | 19 | 4 | 12 | 12 |
| Luis Ortíz | 2015-2016 | 1 | 0 | 1.000 | 4.55 | 23 | 0 | 0 | 0 | 1 | 31.2 | 41 | 16 | 1 | 14 | 24 |
| Reynaldo Ortíz | 2020-2020 | 3 | 8 | .273 | 5.20 | 14 | 14 | 0 | 0 | 0 | 90.0 | 102 | 52 | 9 | 38 | 67 |
| Doruk Oyan | 2020-2022 | 22 | 21 | .512 | 3.43 | 60 | 60 | 3 | 0 | 0 | 373.0 | 352 | 142 | 21 | 182 | 334 |
