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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jimmy O'Flahavan | 2033-2034 | 12 | 9 | .571 | 4.10 | 31 | 31 | 2 | 1 | 0 | 197.2 | 192 | 90 | 21 | 60 | 160 |
| Carl O'Malloy | 2015-2017 | 0 | 1 | .000 | 6.33 | 54 | 0 | 0 | 0 | 1 | 58.1 | 69 | 41 | 18 | 26 | 42 |
| Anderson O'Mara | 2029-2033 | 1 | 3 | .250 | 5.40 | 18 | 0 | 0 | 0 | 0 | 36.2 | 54 | 22 | 6 | 9 | 22 |
| Aaron O'Neill | 2015-2019 | 5 | 11 | .312 | 5.17 | 44 | 25 | 0 | 0 | 0 | 155.0 | 167 | 89 | 23 | 65 | 97 |
| Ron O'Slattery | 2018-2018 | 4 | 2 | .667 | 6.26 | 20 | 10 | 0 | 0 | 0 | 83.1 | 99 | 58 | 14 | 38 | 61 |
| Jake O'Tomalty | 2020-2026 | 1 | 2 | .333 | 3.81 | 51 | 0 | 0 | 0 | 4 | 52.0 | 39 | 22 | 5 | 29 | 50 |
| Alin Oanta | 2023-2027 | 0 | 1 | .000 | 6.85 | 11 | 3 | 0 | 0 | 0 | 23.2 | 28 | 18 | 2 | 21 | 22 |
| Goodluck Obasanjo | 2031-2032 | 5 | 11 | .312 | 4.07 | 36 | 17 | 1 | 0 | 1 | 146.0 | 134 | 66 | 13 | 69 | 99 |
| Jesús Olvero | 2023-2025 | 0 | 3 | .000 | 6.25 | 84 | 0 | 0 | 0 | 7 | 72.0 | 91 | 50 | 9 | 35 | 57 |
| Marcos Oquendo | 2030-2034 | 11 | 12 | .478 | 3.62 | 96 | 1 | 1 | 0 | 4 | 107.0 | 97 | 43 | 8 | 45 | 111 |
| Juan Ordóńez | 2028-2028 | 0 | 1 | .000 | 1.23 | 1 | 1 | 0 | 0 | 0 | 7.1 | 10 | 1 | 0 | 0 | 3 |
| Ramón Ortega | 2015-2024 | 11 | 19 | .367 | 3.81 | 41 | 41 | 4 | 1 | 0 | 272.0 | 230 | 115 | 30 | 83 | 264 |
| Roberto Ortega | 2018-2019 | 21 | 14 | .600 | 2.71 | 46 | 46 | 1 | 0 | 0 | 305.0 | 263 | 92 | 33 | 29 | 304 |
| Alberto Ortíz | 2015-2021 | 11 | 8 | .579 | 4.70 | 194 | 0 | 0 | 0 | 1 | 249.0 | 228 | 130 | 36 | 115 | 215 |
| José Ortíz | 2024-2025 | 3 | 3 | .500 | 5.19 | 27 | 0 | 0 | 0 | 1 | 43.1 | 44 | 25 | 5 | 24 | 23 |
| Martin Ortíz | 2034-2034 | 0 | 1 | .000 | 10.12 | 2 | 0 | 0 | 0 | 0 | 2.2 | 3 | 3 | 1 | 1 | 3 |
| Pedro Ortíz | 2020-2033 | 7 | 9 | .438 | 3.51 | 66 | 24 | 1 | 0 | 0 | 192.1 | 177 | 75 | 15 | 53 | 129 |
| Reynaldo Ortíz | 2024-2027 | 1 | 7 | .125 | 4.33 | 19 | 14 | 0 | 0 | 0 | 95.2 | 80 | 46 | 4 | 59 | 66 |
| Vincente Ortíz | 2024-2032 | 1 | 3 | .250 | 4.26 | 43 | 0 | 0 | 0 | 1 | 44.1 | 45 | 21 | 1 | 22 | 23 |
| Richard Osborn | 2030-2034 | 5 | 2 | .714 | 2.76 | 35 | 0 | 0 | 0 | 9 | 42.1 | 37 | 13 | 6 | 17 | 35 |
| Jorge Otero | 2030-2030 | 10 | 2 | .833 | 2.08 | 19 | 19 | 1 | 1 | 0 | 117.0 | 82 | 27 | 8 | 38 | 127 |
| Yajirobei Otomo | 2028-2034 | 14 | 10 | .583 | 2.92 | 125 | 0 | 0 | 0 | 22 | 129.1 | 98 | 42 | 11 | 57 | 133 |
| Bill Oulton | 2021-2033 | 28 | 19 | .596 | 3.46 | 69 | 59 | 3 | 2 | 0 | 421.2 | 384 | 162 | 29 | 212 | 306 |
| Mike Owens | 2030-2034 | 5 | 9 | .357 | 5.24 | 23 | 23 | 0 | 0 | 0 | 137.1 | 143 | 80 | 17 | 72 | 84 |
