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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Brian O'Brian | 2013-2022 | 1 | 0 | 1.000 | 15.00 | 1 | 0 | 0 | 0 | 0 | 3.0 | 7 | 5 | 0 | 1 | 0 |
| Paul O'Callahan | 2020-2022 | 0 | 0 | .000 | 7.31 | 16 | 0 | 0 | 0 | 1 | 28.1 | 36 | 23 | 5 | 17 | 13 |
| Jimmy O'Flahavan | 2031-2040 | 7 | 24 | .226 | 6.17 | 44 | 44 | 0 | 0 | 0 | 252.1 | 298 | 173 | 43 | 83 | 138 |
| Anderson O'Mara | 2026-2036 | 17 | 16 | .515 | 3.41 | 189 | 0 | 0 | 0 | 34 | 256.1 | 246 | 97 | 32 | 55 | 162 |
| Ron O'Slattery | 2020-2021 | 1 | 1 | .500 | 9.58 | 4 | 1 | 0 | 0 | 0 | 10.1 | 20 | 11 | 0 | 1 | 4 |
| Jake O'Tomalty | 2019-2027 | 2 | 2 | .500 | 3.02 | 33 | 0 | 0 | 0 | 2 | 41.2 | 39 | 14 | 5 | 17 | 28 |
| Alin Oanta | 2021-2022 | 8 | 9 | .471 | 4.95 | 35 | 16 | 0 | 0 | 1 | 100.0 | 97 | 55 | 14 | 51 | 68 |
| Goodluck Obasanjo | 2032-2041 | 6 | 3 | .667 | 4.03 | 40 | 3 | 0 | 0 | 5 | 58.0 | 52 | 26 | 5 | 39 | 41 |
| Piotr Oja | 2030-2034 | 24 | 23 | .511 | 3.89 | 135 | 37 | 1 | 1 | 7 | 404.2 | 388 | 175 | 45 | 141 | 385 |
| Ainanani Oliwa | 2038-2040 | 1 | 2 | .333 | 4.10 | 28 | 0 | 0 | 0 | 0 | 41.2 | 38 | 19 | 6 | 16 | 31 |
| Jesús Olvero | 2021-2023 | 2 | 7 | .222 | 4.23 | 58 | 0 | 0 | 0 | 12 | 78.2 | 71 | 37 | 7 | 49 | 59 |
| Marcos Oquendo | 2030-2041 | 1 | 1 | .500 | 11.12 | 6 | 0 | 0 | 0 | 0 | 11.1 | 18 | 14 | 4 | 2 | 15 |
| Juan Ordóńez | 2032-2032 | 0 | 2 | .000 | 6.07 | 3 | 3 | 0 | 0 | 0 | 13.1 | 20 | 9 | 2 | 1 | 2 |
| Gerald Orlebar | 2036-2042 | 24 | 23 | .511 | 3.69 | 71 | 71 | 2 | 0 | 0 | 414.1 | 413 | 170 | 42 | 87 | 311 |
| Ramón Ortega | 2013-2028 | 131 | 75 | .636 | 3.21 | 314 | 261 | 39 | 12 | 5 | 1935.1 | 1624 | 690 | 189 | 547 | 1849 |
| Roberto Ortega | 2019-2020 | 8 | 10 | .444 | 3.26 | 27 | 27 | 3 | 0 | 0 | 190.2 | 190 | 69 | 11 | 31 | 132 |
| José Ortíz | 2023-2028 | 2 | 5 | .286 | 3.44 | 31 | 0 | 0 | 0 | 5 | 34.0 | 51 | 13 | 4 | 13 | 28 |
| Pedro Ortíz | 2020-2038 | 47 | 30 | .610 | 3.32 | 247 | 63 | 3 | 0 | 6 | 716.0 | 668 | 264 | 48 | 240 | 545 |
| Vincente Ortíz | 2023-2028 | 0 | 4 | .000 | 7.88 | 35 | 0 | 0 | 0 | 0 | 53.2 | 68 | 47 | 4 | 45 | 19 |
| Richard Osborn | 2029-2034 | 3 | 3 | .500 | 4.35 | 38 | 0 | 0 | 0 | 1 | 62.0 | 69 | 30 | 9 | 17 | 57 |
| Gus Osborne | 2036-2038 | 2 | 0 | 1.000 | 3.12 | 18 | 0 | 0 | 0 | 0 | 40.1 | 42 | 14 | 5 | 11 | 33 |
| Jorge Otero | 2031-2041 | 57 | 26 | .687 | 3.18 | 131 | 131 | 2 | 0 | 0 | 780.2 | 705 | 276 | 81 | 207 | 725 |
| Yajirobei Otomo | 2028-2039 | 21 | 10 | .677 | 3.21 | 106 | 0 | 0 | 0 | 6 | 207.2 | 168 | 74 | 16 | 55 | 176 |
| Aldo Ottens | 2038-2042 | 15 | 20 | .429 | 4.63 | 84 | 41 | 1 | 1 | 4 | 322.2 | 337 | 166 | 43 | 100 | 218 |
| Bill Oulton | 2021-2034 | 93 | 56 | .624 | 3.13 | 210 | 199 | 7 | 1 | 0 | 1375.2 | 1209 | 478 | 93 | 533 | 1065 |
| Mike Owens | 2029-2032 | 0 | 6 | .000 | 8.16 | 10 | 8 | 0 | 0 | 0 | 43.0 | 50 | 39 | 5 | 26 | 27 |
| Nolan Owens | 2042-2042 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 1 |
