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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jonathan O'Brien | 2027-2027 | 0 | 0 | .000 | 6.89 | 3 | 3 | 0 | 0 | 0 | 15.2 | 23 | 12 | 3 | 9 | 14 |
| Steve O'Carry | 2037-2043 | 37 | 37 | .500 | 5.46 | 104 | 100 | 12 | 0 | 2 | 683.0 | 836 | 414 | 114 | 165 | 532 |
| Johnny O'Creagh | 2037-2040 | 5 | 4 | .556 | 9.66 | 60 | 0 | 0 | 0 | 5 | 77.1 | 123 | 83 | 13 | 62 | 55 |
| Tim O'Donnell | 2024-2025 | 4 | 5 | .444 | 7.56 | 20 | 12 | 0 | 0 | 0 | 83.1 | 111 | 70 | 18 | 66 | 58 |
| Andre O'Grotty | 2020-2023 | 35 | 20 | .636 | 4.89 | 72 | 70 | 7 | 1 | 0 | 458.1 | 504 | 249 | 67 | 155 | 348 |
| Jimmy O'Halloran | 2024-2026 | 11 | 17 | .393 | 6.82 | 80 | 28 | 0 | 0 | 3 | 244.0 | 279 | 185 | 48 | 169 | 263 |
| Todd O'Herlihy | 2033-2037 | 15 | 23 | .395 | 6.27 | 112 | 34 | 0 | 0 | 29 | 303.0 | 353 | 211 | 62 | 136 | 340 |
| Tim O'Higgins | 2020-2020 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 1 | 0 |
| Millard O'Rorke | 2025-2035 | 64 | 52 | .552 | 4.96 | 193 | 157 | 3 | 1 | 3 | 1051.1 | 1158 | 579 | 123 | 459 | 830 |
| Mike O'Tracy | 2043-2043 | 5 | 3 | .625 | 4.59 | 33 | 8 | 1 | 0 | 7 | 86.1 | 104 | 44 | 9 | 40 | 79 |
| Nicholas Oakden | 2029-2034 | 5 | 3 | .625 | 5.71 | 59 | 3 | 0 | 0 | 1 | 97.2 | 107 | 62 | 24 | 52 | 103 |
| António Ocampo | 2032-2036 | 27 | 29 | .482 | 6.37 | 80 | 80 | 3 | 1 | 0 | 481.2 | 630 | 341 | 79 | 167 | 295 |
| Arturo Ocasio | 2023-2026 | 13 | 14 | .481 | 6.53 | 77 | 42 | 0 | 0 | 2 | 300.2 | 339 | 218 | 53 | 241 | 272 |
| Ichiyo Ogawa | 2019-2022 | 17 | 14 | .548 | 7.48 | 217 | 0 | 0 | 0 | 32 | 250.1 | 380 | 208 | 27 | 206 | 110 |
| Michihiro Ohayashi | 2036-2037 | 3 | 9 | .250 | 3.92 | 69 | 0 | 0 | 0 | 37 | 78.0 | 96 | 34 | 2 | 30 | 53 |
| Nariaki Ohayashi | 2030-2030 | 0 | 1 | .000 | 4.56 | 13 | 1 | 0 | 0 | 1 | 23.2 | 20 | 12 | 3 | 7 | 28 |
| Kazuhiro Oike | 2029-2030 | 6 | 6 | .500 | 5.52 | 90 | 0 | 0 | 0 | 22 | 132.0 | 161 | 81 | 18 | 58 | 82 |
| Hikaru Okabe | 2015-2015 | 3 | 4 | .429 | 6.17 | 9 | 9 | 1 | 0 | 0 | 58.1 | 66 | 40 | 5 | 37 | 23 |
| Xavier Oliva | 2024-2026 | 15 | 18 | .455 | 5.84 | 43 | 43 | 5 | 0 | 0 | 273.0 | 320 | 177 | 57 | 111 | 295 |
| José Olivas | 2019-2019 | 0 | 0 | .000 | 27.00 | 2 | 0 | 0 | 0 | 0 | 4.1 | 10 | 13 | 3 | 9 | 0 |
| Al Oliver | 2024-2024 | 2 | 7 | .222 | 6.77 | 17 | 16 | 0 | 0 | 0 | 94.1 | 142 | 71 | 14 | 43 | 74 |
| Phil Oliver | 2030-2033 | 6 | 7 | .462 | 6.22 | 81 | 0 | 0 | 0 | 10 | 114.1 | 120 | 79 | 21 | 73 | 119 |
| Bernardo Olivo | 2037-2037 | 2 | 4 | .333 | 7.81 | 26 | 6 | 0 | 0 | 1 | 68.0 | 100 | 59 | 18 | 21 | 40 |
| Simeone Omoboni | 2027-2027 | 3 | 2 | .600 | 11.77 | 20 | 0 | 0 | 0 | 0 | 26.0 | 51 | 34 | 6 | 17 | 19 |
| Kenji Ono | 2025-2025 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Alfredo Ornelas | 2023-2023 | 0 | 0 | .000 | 21.60 | 1 | 0 | 0 | 0 | 0 | 1.2 | 3 | 4 | 1 | 2 | 0 |
| Jesús Orozco | 2024-2024 | 0 | 0 | .000 | 0.00 | 1 | 1 | 0 | 0 | 0 | 7.0 | 7 | 0 | 0 | 2 | 6 |
| Félix Ortega | 2039-2039 | 0 | 0 | .000 | 20.25 | 1 | 0 | 0 | 0 | 0 | 1.1 | 3 | 3 | 1 | 1 | 0 |
| José Ortega | 2018-2022 | 20 | 25 | .444 | 7.00 | 101 | 58 | 0 | 0 | 1 | 405.0 | 549 | 315 | 61 | 246 | 328 |
| Roberto Ortega | 2042-2043 | 2 | 3 | .400 | 5.91 | 44 | 0 | 0 | 0 | 4 | 74.2 | 76 | 49 | 7 | 54 | 71 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Jesús Ortíz | 2039-2039 | 0 | 0 | .000 | 6.23 | 7 | 0 | 0 | 0 | 1 | 13.0 | 15 | 9 | 1 | 5 | 6 |
| Gil Orton | 2039-2042 | 9 | 9 | .500 | 6.47 | 75 | 17 | 1 | 0 | 4 | 208.2 | 283 | 150 | 25 | 117 | 110 |
| Jarrod Osborne | 2032-2036 | 7 | 13 | .350 | 6.37 | 29 | 24 | 0 | 0 | 1 | 154.0 | 180 | 109 | 14 | 98 | 91 |
| Tadakuni Oshima | 2042-2042 | 1 | 1 | .500 | 5.82 | 13 | 0 | 0 | 0 | 0 | 17.0 | 21 | 11 | 2 | 12 | 18 |
| Ricardo Osorio | 2024-2024 | 0 | 0 | .000 | 7.71 | 1 | 0 | 0 | 0 | 0 | 2.1 | 3 | 2 | 1 | 1 | 0 |
| Vincente Osorio | 2037-2040 | 10 | 16 | .385 | 6.19 | 98 | 33 | 1 | 0 | 4 | 276.1 | 322 | 190 | 19 | 205 | 155 |
| Kuniyuki Ota | 2022-2022 | 0 | 0 | .000 | 102.60 | 1 | 0 | 0 | 0 | 0 | 1.2 | 8 | 19 | 2 | 12 | 0 |
| Rikiya Ota | 2031-2034 | 17 | 33 | .340 | 5.81 | 126 | 43 | 3 | 1 | 15 | 359.2 | 391 | 232 | 37 | 225 | 303 |
| Paco Otero | 2024-2028 | 11 | 8 | .579 | 5.23 | 144 | 0 | 0 | 0 | 10 | 192.2 | 183 | 112 | 41 | 99 | 235 |
| Les Overdevest | 2014-2018 | 33 | 16 | .673 | 4.77 | 64 | 64 | 2 | 1 | 0 | 416.2 | 484 | 221 | 63 | 137 | 275 |
| Charles Owens | 2034-2035 | 2 | 6 | .250 | 5.32 | 60 | 0 | 0 | 0 | 7 | 91.1 | 109 | 54 | 11 | 43 | 82 |
