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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Paul O'Callahan | 0-2022 | 1 | 8 | .111 | 8.96 | 30 | 8 | 0 | 0 | 0 | 70.1 | 101 | 70 | 9 | 41 | 52 |
| Robert O'Connor | 7-0 | 0 | 0 | .000 | 7.71 | 3 | 3 | 0 | 0 | 0 | 9.1 | 15 | 8 | 0 | 5 | 5 |
| Nathaniel O'Heyne | -1-2021 | 8 | 13 | .381 | 4.56 | 45 | 28 | 2 | 0 | 0 | 201.1 | 222 | 102 | 19 | 113 | 103 |
| Aaron O'Neill | -1-2018 | 7 | 7 | .500 | 5.70 | 92 | 17 | 2 | 1 | 1 | 170.2 | 228 | 108 | 17 | 97 | 91 |
| Ron O'Slattery | 2-2021 | 9 | 6 | .600 | 3.60 | 25 | 18 | 2 | 1 | 0 | 127.2 | 137 | 51 | 9 | 45 | 100 |
| Jake O'Tomalty | 4-2026 | 23 | 22 | .511 | 3.06 | 276 | 1 | 0 | 0 | 95 | 294.0 | 223 | 100 | 25 | 167 | 345 |
| Taro Ohayashi | 1-2025 | 8 | 7 | .533 | 3.93 | 79 | 26 | 0 | 0 | 3 | 199.0 | 156 | 87 | 18 | 144 | 157 |
| Jesús Olvero | 0-2026 | 0 | 2 | .000 | 21.60 | 2 | 0 | 0 | 0 | 0 | 1.2 | 6 | 4 | 1 | 2 | 0 |
| Lorenzo Ortega | 0-2020 | 0 | 2 | .000 | 14.73 | 14 | 0 | 0 | 0 | 0 | 18.1 | 43 | 30 | 4 | 14 | 8 |
| Ramón Ortega | 6-2024 | 12 | 3 | .800 | 1.79 | 18 | 18 | 2 | 1 | 0 | 136.0 | 110 | 27 | 5 | 35 | 152 |
| Alberto Ortíz | -1-2022 | 3 | 8 | .273 | 5.50 | 91 | 0 | 0 | 0 | 6 | 109.2 | 100 | 67 | 14 | 66 | 99 |
| Carlos Ortíz | 0-2020 | 0 | 4 | .000 | 6.82 | 6 | 5 | 0 | 0 | 0 | 31.2 | 35 | 24 | 3 | 28 | 10 |
| Pedro Ortíz | 0-2027 | 10 | 7 | .588 | 3.84 | 27 | 16 | 0 | 0 | 0 | 122.0 | 127 | 52 | 10 | 26 | 67 |
| Reynaldo Ortíz | 5-2027 | 23 | 31 | .426 | 4.48 | 87 | 71 | 0 | 0 | 2 | 451.2 | 439 | 225 | 34 | 289 | 377 |
| Vincente Ortíz | 1-2027 | 9 | 16 | .360 | 4.57 | 110 | 0 | 0 | 0 | 16 | 143.2 | 131 | 73 | 9 | 90 | 77 |
