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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ju-hyung O | 2018-2018 | 1 | 0 | 1.000 | 4.55 | 32 | 0 | 0 | 0 | 0 | 55.1 | 49 | 28 | 4 | 21 | 44 |
| Paul O'Callahan | 2017-2025 | 20 | 20 | .500 | 4.54 | 122 | 35 | 1 | 0 | 8 | 311.0 | 340 | 157 | 48 | 123 | 260 |
| Jimmy O'Flahavan | 2030-2030 | 10 | 4 | .714 | 2.93 | 17 | 17 | 1 | 0 | 0 | 122.2 | 108 | 40 | 8 | 37 | 84 |
| Vincent O'Higgin | 2029-2030 | 6 | 5 | .545 | 3.83 | 18 | 18 | 0 | 0 | 0 | 124.2 | 121 | 53 | 10 | 64 | 106 |
| Aaron O'Neill | 2020-2021 | 7 | 8 | .467 | 3.90 | 73 | 0 | 0 | 0 | 20 | 67.0 | 64 | 29 | 6 | 31 | 45 |
| Ron O'Slattery | 2017-2022 | 15 | 16 | .484 | 5.69 | 46 | 43 | 0 | 0 | 0 | 261.0 | 305 | 165 | 37 | 99 | 212 |
| Will O'Slattery | 2021-2030 | 3 | 11 | .214 | 4.37 | 77 | 3 | 0 | 0 | 26 | 134.0 | 131 | 65 | 11 | 82 | 85 |
| Jake O'Tomalty | 2026-2026 | 1 | 0 | 1.000 | 3.00 | 5 | 0 | 0 | 0 | 0 | 12.0 | 11 | 4 | 1 | 6 | 19 |
| Floyd Oglethorpe | 2017-2018 | 7 | 13 | .350 | 7.60 | 68 | 29 | 1 | 0 | 0 | 151.2 | 221 | 128 | 25 | 54 | 113 |
| Taro Ohayashi | 2023-2027 | 5 | 7 | .417 | 4.02 | 49 | 18 | 0 | 0 | 5 | 116.1 | 100 | 52 | 4 | 60 | 76 |
| Noburo Oishi | 2029-2031 | 6 | 5 | .545 | 4.83 | 25 | 3 | 0 | 0 | 4 | 50.1 | 46 | 27 | 6 | 24 | 61 |
| Luis Oliva | 2022-2024 | 5 | 5 | .500 | 4.27 | 40 | 0 | 0 | 0 | 2 | 84.1 | 95 | 40 | 9 | 32 | 61 |
| Emil Olsson | 2027-2032 | 13 | 10 | .565 | 4.66 | 30 | 30 | 0 | 0 | 0 | 172.0 | 189 | 89 | 18 | 46 | 91 |
| Jesús Olvero | 2026-2027 | 3 | 1 | .750 | 3.60 | 48 | 0 | 0 | 0 | 4 | 60.0 | 50 | 24 | 8 | 23 | 45 |
| Kazu Omori | 2030-2030 | 3 | 2 | .600 | 2.89 | 22 | 0 | 0 | 0 | 0 | 37.1 | 30 | 12 | 3 | 13 | 26 |
| Tzu-hsia Ong | 2031-2032 | 1 | 1 | .500 | 7.71 | 5 | 0 | 0 | 0 | 0 | 4.2 | 3 | 4 | 1 | 4 | 3 |
| Aurelio Ornelas | 2031-2032 | 8 | 5 | .615 | 3.25 | 44 | 0 | 0 | 0 | 14 | 44.1 | 40 | 16 | 3 | 23 | 31 |
| Lorenzo Ortega | 2018-2019 | 2 | 6 | .250 | 8.13 | 33 | 0 | 0 | 0 | 16 | 27.2 | 44 | 25 | 7 | 13 | 20 |
| Alberto Ortíz | 2023-2023 | 1 | 0 | 1.000 | 4.05 | 8 | 0 | 0 | 0 | 0 | 20.0 | 16 | 9 | 1 | 9 | 15 |
| Armando Ortíz | 2028-2029 | 5 | 8 | .385 | 4.98 | 54 | 22 | 0 | 0 | 2 | 137.1 | 148 | 76 | 8 | 82 | 97 |
| Cisco Ortíz | 2026-2032 | 8 | 19 | .296 | 5.48 | 62 | 23 | 1 | 0 | 1 | 212.0 | 245 | 129 | 23 | 92 | 163 |
| José Ortíz | 2026-2030 | 21 | 18 | .538 | 3.98 | 81 | 37 | 1 | 0 | 2 | 348.2 | 344 | 154 | 30 | 150 | 225 |
| José Ortíz | 2023-2023 | 0 | 0 | .000 | 3.38 | 21 | 0 | 0 | 0 | 3 | 26.2 | 17 | 10 | 0 | 14 | 22 |
| Luis Ortíz | 2027-2028 | 6 | 8 | .429 | 4.96 | 37 | 13 | 0 | 0 | 0 | 150.2 | 154 | 83 | 14 | 67 | 98 |
| Martin Ortíz | 2029-2031 | 7 | 3 | .700 | 2.89 | 67 | 0 | 0 | 0 | 3 | 102.2 | 84 | 33 | 13 | 32 | 75 |
| Pedro Ortíz | 2030-2030 | 0 | 1 | .000 | 5.79 | 2 | 0 | 0 | 0 | 0 | 4.2 | 3 | 3 | 0 | 2 | 3 |
| Reynaldo Ortíz | 2022-2026 | 6 | 4 | .600 | 2.64 | 25 | 20 | 0 | 0 | 0 | 126.1 | 93 | 37 | 5 | 74 | 135 |
| Vincente Ortíz | 2027-2029 | 5 | 0 | 1.000 | 4.54 | 40 | 1 | 0 | 0 | 3 | 81.1 | 91 | 41 | 8 | 27 | 44 |
| Gus Osborne | 2032-2032 | 0 | 0 | .000 | 13.50 | 1 | 0 | 0 | 0 | 0 | 0.2 | 3 | 1 | 0 | 0 | 0 |
| Jorge Otero | 2029-2029 | 3 | 3 | .500 | 4.92 | 10 | 10 | 0 | 0 | 0 | 53.0 | 50 | 29 | 2 | 25 | 49 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Doruk Oyan | 2016-2018 | 25 | 21 | .543 | 5.79 | 55 | 55 | 2 | 2 | 0 | 321.2 | 391 | 207 | 58 | 143 | 333 |
