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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tom O'Day | 2018-2032 | 174 | 109 | .615 | 3.96 | 447 | 409 | 18 | 6 | 2 | 2707.2 | 2700 | 1192 | 179 | 1070 | 2411 |
| Eric O'Farrell | 2020-2023 | 8 | 5 | .615 | 5.53 | 105 | 6 | 0 | 0 | 2 | 200.1 | 226 | 123 | 26 | 86 | 115 |
| Clayton O'Neil | 2016-2029 | 49 | 59 | .454 | 4.64 | 562 | 67 | 5 | 0 | 111 | 1064.2 | 1121 | 549 | 148 | 440 | 896 |
| Carl O'Quinn | 2017-2022 | 50 | 67 | .427 | 5.44 | 149 | 148 | 8 | 0 | 0 | 898.0 | 1005 | 543 | 176 | 325 | 640 |
| José Ochoa | 2018-2029 | 36 | 40 | .474 | 5.09 | 622 | 0 | 0 | 0 | 39 | 765.1 | 780 | 433 | 83 | 429 | 670 |
| Ron Ogden | 2032-2032 | 2 | 2 | .500 | 5.35 | 5 | 5 | 0 | 0 | 0 | 35.1 | 33 | 21 | 6 | 17 | 36 |
| Hideki Ohayashi | 2021-2022 | 0 | 0 | .000 | 3.57 | 10 | 0 | 0 | 0 | 1 | 17.2 | 17 | 7 | 2 | 15 | 12 |
| Masazumi Ohayashi | 2030-2032 | 29 | 21 | .580 | 4.15 | 60 | 60 | 1 | 0 | 0 | 407.1 | 381 | 188 | 51 | 127 | 381 |
| Masayuki Okada | 2018-2018 | 0 | 0 | .000 | 11.88 | 5 | 0 | 0 | 0 | 0 | 8.1 | 15 | 11 | 3 | 4 | 5 |
| Naoki Okada | 2032-2032 | 0 | 1 | .000 | 16.62 | 1 | 1 | 0 | 0 | 0 | 4.1 | 8 | 8 | 0 | 5 | 3 |
| Izumo Okumura | 2019-2019 | 0 | 0 | .000 | 8.44 | 8 | 0 | 0 | 0 | 1 | 16.0 | 17 | 15 | 7 | 14 | 20 |
| Jeff Olsen | 2014-2016 | 31 | 32 | .492 | 5.10 | 82 | 76 | 2 | 0 | 1 | 443.0 | 474 | 251 | 57 | 148 | 235 |
| Taro Omori | 2018-2028 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 0 | 0 | 0 | 0 | 0 |
| Katsumi Onishi | 2017-2024 | 20 | 20 | .500 | 5.53 | 315 | 0 | 0 | 0 | 6 | 379.0 | 428 | 233 | 67 | 261 | 354 |
| Takao Onishi | 2018-2022 | 0 | 7 | .000 | 6.84 | 17 | 8 | 0 | 0 | 0 | 52.2 | 73 | 40 | 8 | 22 | 26 |
| Yasujiro Ono | 2017-2029 | 40 | 34 | .541 | 4.45 | 583 | 12 | 0 | 0 | 65 | 572.2 | 536 | 283 | 69 | 309 | 733 |
| Rick Oram | 2018-2018 | 0 | 0 | .000 | 1.69 | 13 | 0 | 0 | 0 | 0 | 5.1 | 6 | 1 | 0 | 6 | 4 |
| Giuseppe Orati | 2027-2029 | 1 | 0 | 1.000 | 6.32 | 10 | 0 | 0 | 0 | 0 | 15.2 | 16 | 11 | 5 | 4 | 20 |
| Gustavo Ortega | 2031-2032 | 2 | 2 | .500 | 3.86 | 6 | 4 | 0 | 0 | 0 | 25.2 | 27 | 11 | 3 | 7 | 12 |
| Ramiro Ortega | 2012-2030 | 79 | 84 | .485 | 4.74 | 1055 | 49 | 1 | 0 | 51 | 1507.2 | 1714 | 794 | 171 | 514 | 1149 |
| Félix Ortíz | 2021-2024 | 4 | 6 | .400 | 4.50 | 116 | 0 | 0 | 0 | 2 | 140.0 | 149 | 70 | 11 | 69 | 104 |
| Jesús Ortíz | 2021-2026 | 25 | 17 | .595 | 4.53 | 281 | 6 | 0 | 0 | 36 | 403.2 | 408 | 203 | 42 | 160 | 323 |
| Jorge Ortíz | 2019-2029 | 73 | 72 | .503 | 5.27 | 284 | 192 | 3 | 0 | 3 | 1271.1 | 1279 | 745 | 211 | 684 | 1184 |
| Pedro Ortíz | 2017-2017 | 0 | 0 | .000 | 11.00 | 5 | 0 | 0 | 0 | 0 | 9.0 | 13 | 11 | 3 | 4 | 6 |
| Robert Osborne | 2016-2018 | 18 | 30 | .375 | 5.63 | 87 | 76 | 0 | 0 | 0 | 372.2 | 414 | 233 | 43 | 192 | 264 |
| Eisuke Ota | 2027-2027 | 0 | 0 | .000 | 1.83 | 3 | 3 | 0 | 0 | 0 | 19.2 | 13 | 4 | 2 | 3 | 10 |
| Fernando Otero | 2026-2026 | 2 | 5 | .286 | 6.04 | 9 | 8 | 0 | 0 | 1 | 44.2 | 58 | 30 | 7 | 10 | 27 |
| Vicente Otero | 2020-2031 | 21 | 26 | .447 | 4.89 | 355 | 2 | 0 | 0 | 29 | 508.0 | 519 | 276 | 72 | 231 | 459 |
| Woody Owen | 2017-2024 | 61 | 57 | .517 | 5.86 | 216 | 130 | 7 | 2 | 5 | 907.1 | 1037 | 591 | 145 | 443 | 694 |
| Jacob Owens | 2022-2023 | 1 | 4 | .200 | 5.85 | 53 | 1 | 0 | 0 | 1 | 84.2 | 94 | 55 | 18 | 57 | 46 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Tom Owens | 2012-2022 | 87 | 103 | .458 | 4.38 | 350 | 275 | 6 | 1 | 7 | 1618.0 | 1706 | 788 | 99 | 650 | 1070 |
| Tom Owens | 2013-2029 | 132 | 141 | .484 | 4.98 | 468 | 366 | 6 | 1 | 11 | 2365.1 | 2747 | 1308 | 365 | 790 | 1620 |
| Kichibei Ozawa | 2026-2030 | 18 | 27 | .400 | 5.34 | 83 | 55 | 2 | 0 | 4 | 372.1 | 423 | 221 | 59 | 139 | 233 |
