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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 | 0-0 | 1 | 0 | 1.000 | 4.55 | 32 | 0 | 0 | 0 | 0 | 55.1 | 49 | 28 | 4 | 21 | 44 |
| Paul O'Callahan | 3-2022 | 20 | 20 | .500 | 4.54 | 122 | 35 | 1 | 0 | 8 | 311.0 | 340 | 157 | 48 | 123 | 260 |
| Aaron O'Neill | 0-2018 | 7 | 8 | .467 | 3.90 | 73 | 0 | 0 | 0 | 20 | 67.0 | 64 | 29 | 6 | 31 | 45 |
| Ron O'Slattery | 2-2021 | 15 | 16 | .484 | 5.69 | 46 | 43 | 0 | 0 | 0 | 261.0 | 305 | 165 | 37 | 99 | 212 |
| Will O'Slattery | 0-2 | 2 | 11 | .154 | 3.65 | 53 | 3 | 0 | 0 | 25 | 69.0 | 64 | 28 | 7 | 39 | 42 |
| Jake O'Tomalty | 0-2026 | 1 | 0 | 1.000 | 3.00 | 5 | 0 | 0 | 0 | 0 | 12.0 | 11 | 4 | 1 | 6 | 19 |
| Floyd Oglethorpe | 1-0 | 7 | 13 | .350 | 7.60 | 68 | 29 | 1 | 0 | 0 | 151.2 | 221 | 128 | 25 | 54 | 113 |
| Taro Ohayashi | 1-2025 | 5 | 7 | .417 | 4.16 | 41 | 18 | 0 | 0 | 2 | 110.1 | 94 | 51 | 4 | 58 | 71 |
| Luis Oliva | 0-0 | 5 | 5 | .500 | 4.27 | 40 | 0 | 0 | 0 | 2 | 84.1 | 95 | 40 | 9 | 32 | 61 |
| Jesús Olvero | 0-2026 | 0 | 0 | .000 | 2.43 | 32 | 0 | 0 | 0 | 4 | 37.0 | 27 | 10 | 4 | 15 | 31 |
| Lorenzo Ortega | 0-2020 | 2 | 6 | .250 | 8.13 | 33 | 0 | 0 | 0 | 16 | 27.2 | 44 | 25 | 7 | 13 | 20 |
| Alberto Ortíz | 0-2022 | 1 | 0 | 1.000 | 4.05 | 8 | 0 | 0 | 0 | 0 | 20.0 | 16 | 9 | 1 | 9 | 15 |
| Cisco Ortíz | 0-2 | 4 | 11 | .267 | 5.07 | 16 | 16 | 1 | 0 | 0 | 104.2 | 108 | 59 | 9 | 40 | 76 |
| José Ortíz | 0-2 | 4 | 1 | .800 | 2.52 | 6 | 6 | 0 | 0 | 0 | 39.1 | 35 | 11 | 4 | 18 | 28 |
| José Ortíz | 0-2026 | 0 | 0 | .000 | 3.38 | 21 | 0 | 0 | 0 | 3 | 26.2 | 17 | 10 | 0 | 14 | 22 |
| Reynaldo Ortíz | 3-2026 | 6 | 4 | .600 | 2.64 | 25 | 20 | 0 | 0 | 0 | 126.1 | 93 | 37 | 5 | 74 | 135 |
| Doruk Oyan | 4-6 | 25 | 21 | .543 | 5.79 | 55 | 55 | 2 | 2 | 0 | 321.2 | 391 | 207 | 58 | 143 | 333 |
