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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 | 2015-2022 | 1 | 8 | .111 | 8.96 | 30 | 8 | 0 | 0 | 0 | 70.1 | 101 | 70 | 9 | 41 | 52 |
| Robert O'Connor | 2018-2030 | 0 | 0 | .000 | 7.71 | 3 | 3 | 0 | 0 | 0 | 9.1 | 15 | 8 | 0 | 5 | 5 |
| Jimmy O'Flahavan | 2030-2032 | 25 | 10 | .714 | 3.12 | 66 | 42 | 5 | 2 | 8 | 334.2 | 269 | 116 | 37 | 145 | 284 |
| Nathaniel O'Heyne | 2019-2021 | 8 | 13 | .381 | 4.56 | 45 | 28 | 2 | 0 | 0 | 201.1 | 222 | 102 | 19 | 113 | 103 |
| Aaron O'Neill | 2016-2019 | 7 | 7 | .500 | 5.70 | 92 | 17 | 2 | 1 | 1 | 170.2 | 228 | 108 | 17 | 97 | 91 |
| Ron O'Slattery | 2016-2022 | 9 | 6 | .600 | 3.60 | 25 | 18 | 2 | 1 | 0 | 127.2 | 137 | 51 | 9 | 45 | 100 |
| Jake O'Tomalty | 2017-2026 | 23 | 22 | .511 | 3.06 | 276 | 1 | 0 | 0 | 95 | 294.0 | 223 | 100 | 25 | 167 | 345 |
| Ricky O'Toole | 2034-2034 | 3 | 1 | .750 | 2.42 | 30 | 0 | 0 | 0 | 0 | 26.0 | 26 | 7 | 2 | 8 | 12 |
| Taro Ohayashi | 2024-2029 | 15 | 17 | .469 | 4.33 | 124 | 47 | 2 | 0 | 3 | 384.2 | 326 | 185 | 30 | 272 | 315 |
| Noburo Oishi | 2029-2034 | 11 | 17 | .393 | 5.91 | 86 | 23 | 0 | 0 | 2 | 199.1 | 227 | 131 | 33 | 124 | 170 |
| Emil Olsson | 2028-2034 | 11 | 15 | .423 | 3.85 | 173 | 1 | 0 | 0 | 9 | 252.1 | 258 | 108 | 25 | 86 | 195 |
| Jesús Olvero | 2023-2026 | 0 | 2 | .000 | 21.60 | 2 | 0 | 0 | 0 | 0 | 1.2 | 6 | 4 | 1 | 2 | 0 |
| Kazu Omori | 2030-2034 | 10 | 7 | .588 | 4.97 | 85 | 6 | 0 | 0 | 4 | 130.1 | 142 | 72 | 20 | 51 | 89 |
| Tzu-hsia Ong | 2030-2031 | 0 | 0 | .000 | 2.25 | 6 | 0 | 0 | 0 | 1 | 12.0 | 6 | 3 | 0 | 5 | 6 |
| Marcos Oquendo | 2033-2034 | 7 | 1 | .875 | 2.23 | 61 | 0 | 0 | 0 | 8 | 72.2 | 64 | 18 | 5 | 21 | 92 |
| Aurelio Ornelas | 2031-2034 | 2 | 1 | .667 | 3.51 | 19 | 1 | 0 | 0 | 1 | 33.1 | 32 | 13 | 1 | 21 | 24 |
| Curt Orser | 2034-2034 | 0 | 0 | .000 | 3.76 | 15 | 0 | 0 | 0 | 0 | 26.1 | 20 | 11 | 5 | 15 | 23 |
| Lorenzo Ortega | 2016-2020 | 0 | 2 | .000 | 14.73 | 14 | 0 | 0 | 0 | 0 | 18.1 | 43 | 30 | 4 | 14 | 8 |
| Ramón Ortega | 2022-2028 | 13 | 4 | .765 | 2.71 | 28 | 20 | 2 | 1 | 0 | 163.0 | 152 | 49 | 9 | 45 | 162 |
| Alberto Ortíz | 2018-2022 | 3 | 8 | .273 | 5.50 | 91 | 0 | 0 | 0 | 6 | 109.2 | 100 | 67 | 14 | 66 | 99 |
| Carlos Ortíz | 2020-2020 | 0 | 4 | .000 | 6.82 | 6 | 5 | 0 | 0 | 0 | 31.2 | 35 | 24 | 3 | 28 | 10 |
| Pedro Ortíz | 2026-2033 | 23 | 22 | .511 | 4.26 | 131 | 37 | 2 | 2 | 4 | 361.1 | 372 | 171 | 25 | 106 | 236 |
| Reynaldo Ortíz | 2022-2027 | 23 | 31 | .426 | 4.48 | 87 | 71 | 0 | 0 | 2 | 451.2 | 439 | 225 | 34 | 289 | 377 |
| Vincente Ortíz | 2023-2028 | 12 | 17 | .414 | 4.35 | 133 | 0 | 0 | 0 | 19 | 198.2 | 178 | 96 | 15 | 119 | 109 |
| Yajirobei Otomo | 2029-2034 | 12 | 10 | .545 | 3.24 | 123 | 0 | 0 | 0 | 49 | 130.2 | 101 | 47 | 11 | 67 | 136 |
| Mike Owens | 2031-2034 | 13 | 14 | .481 | 4.11 | 52 | 32 | 0 | 0 | 0 | 240.2 | 221 | 110 | 15 | 140 | 143 |
