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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 | 6-2020 | 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 | 3-2025 | 21 | 19 | .525 | 3.07 | 242 | 1 | 0 | 0 | 90 | 254.2 | 192 | 87 | 22 | 145 | 300 |
| Taro Ohayashi | 0-2025 | 4 | 5 | .444 | 4.79 | 56 | 20 | 0 | 0 | 1 | 126.0 | 107 | 67 | 12 | 103 | 103 |
| Lorenzo Ortega | 0-2020 | 0 | 2 | .000 | 14.73 | 14 | 0 | 0 | 0 | 0 | 18.1 | 43 | 30 | 4 | 14 | 8 |
| Ramón Ortega | 5-2024 | 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 |
| Reynaldo Ortíz | 3-2025 | 20 | 22 | .476 | 4.02 | 68 | 58 | 0 | 0 | 2 | 369.1 | 334 | 165 | 26 | 220 | 314 |
| Vincente Ortíz | 0-2025 | 1 | 3 | .250 | 4.47 | 43 | 0 | 0 | 0 | 1 | 58.1 | 51 | 29 | 3 | 36 | 32 |
