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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Hyo-sang O | 2027-2027 | .315 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Dylan O'Brien | 2018-2019 | .206 | 7 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Callaghan | 2022-2024 | .265 | 12 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Scott O'Connor | 2024-2027 | .317 | 49 | 233 | 0 | 0 | 0 | 0.00 | 0 |
| Tom O'Day | 2017-2018 | .000 | 0 | 0 | 22 | 13 | 0 | 3.79 | 346 |
| Adam O'Dell | 2024-2027 | .284 | 56 | 205 | 0 | 0 | 0 | 0.00 | 0 |
| Danny O'Doherty | 2021-2027 | .267 | 4 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Reese O'Donnell | 2016-2020 | .255 | 13 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| David O'Farrell | 2026-2027 | .302 | 26 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Eric O'Farrell | 2017-2026 | .000 | 0 | 0 | 42 | 36 | 104 | 4.66 | 366 |
| Steve O'Farrell | 2021-2027 | .280 | 122 | 484 | 0 | 0 | 0 | 0.00 | 0 |
| Bryan O'Herlihy | 2025-2026 | .221 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Reese O'Higgins | 2014-2021 | .315 | 10 | 159 | 0 | 0 | 0 | 0.00 | 0 |
| Bob O'Moriartie | 2025-2027 | .221 | 24 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| Joe O'Neal | 2012-2021 | .286 | 25 | 115 | 0 | 0 | 0 | 0.00 | 0 |
| Clayton O'Neil | 2016-2020 | .000 | 0 | 0 | 8 | 7 | 55 | 2.45 | 149 |
| Mark O'Neil | 2019-2024 | .310 | 49 | 263 | 0 | 0 | 0 | 0.00 | 0 |
| Carl O'Quinn | 2016-2022 | .000 | 0 | 0 | 20 | 20 | 0 | 3.65 | 314 |
| Roy O'Quinn | 2013-2022 | .237 | 59 | 148 | 0 | 0 | 0 | 0.00 | 0 |
| Foster O'Reilly | 2012-2021 | .297 | 8 | 153 | 0 | 0 | 0 | 0.00 | 0 |
| Gene O'Reilly | 2020-2021 | .238 | 13 | 86 | 0 | 0 | 0 | 0.00 | 0 |
| Everett O'Rorke | 2019-2026 | .278 | 57 | 207 | 0 | 0 | 0 | 0.00 | 0 |
| John Oakes | 2026-2026 | .314 | 4 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Anastasio Ocampo | 2027-2027 | .293 | 8 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Domingo Ochoa | 2026-2027 | .267 | 20 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| José Ochoa | 2018-2022 | .000 | 0 | 0 | 7 | 14 | 27 | 3.16 | 160 |
| Hidehira Ogawa | 2023-2024 | .244 | 9 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Takeji Ogawa | 2026-2027 | .000 | 0 | 0 | 23 | 30 | 0 | 4.79 | 335 |
| Tomohiko Ogawa | 2022-2027 | .271 | 60 | 285 | 0 | 0 | 0 | 0.00 | 0 |
| Bryant Oglethorpe | 2018-2020 | .000 | 0 | 0 | 14 | 14 | 18 | 5.53 | 224 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tony Oglethorpe | 2015-2027 | .299 | 60 | 290 | 0 | 0 | 0 | 0.00 | 0 |
| Jun'ichi Ogura | 2017-2021 | .259 | 7 | 103 | 0 | 0 | 0 | 0.00 | 0 |
| Nobukazu Ogura | 2021-2026 | .274 | 119 | 450 | 0 | 0 | 0 | 0.00 | 0 |
| Hideki Ohayashi | 2016-2023 | .000 | 0 | 0 | 19 | 21 | 21 | 5.30 | 358 |
| Hideyori Ohayashi | 2021-2027 | .000 | 0 | 0 | 9 | 8 | 30 | 5.09 | 130 |
| Kojuro Ohayashi | 2015-2020 | .235 | 9 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Kyoji Ohayashi | 2022-2023 | .000 | 0 | 0 | 10 | 19 | 0 | 6.10 | 224 |
| Tatsukichi Ohayashi | 2015-2015 | .227 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Kagetoki Ohayashi Jr. | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ojeda | 2020-2021 | .000 | 0 | 0 | 7 | 2 | 1 | 6.71 | 93 |
| Keitaro Ojima | 2017-2023 | .297 | 217 | 637 | 0 | 0 | 0 | 0.00 | 0 |
| Takiji Ojima | 2021-2027 | .250 | 43 | 190 | 0 | 0 | 0 | 0.00 | 0 |
| Yoshino Okabe | 2016-2025 | .280 | 56 | 203 | 0 | 0 | 0 | 0.00 | 0 |
| Josuke Okada | 2025-2026 | .000 | 0 | 0 | 1 | 5 | 1 | 5.79 | 28 |
| Masayuki Okada | 2017-2021 | .000 | 0 | 0 | 22 | 9 | 11 | 4.59 | 329 |
| Masamichi Okamoto | 2021-2021 | .158 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Izumo Okumura | 2019-2021 | .000 | 0 | 0 | 4 | 1 | 2 | 3.89 | 181 |
| Katsunosuki Okumura | 2023-2026 | .000 | 0 | 0 | 21 | 26 | 1 | 5.66 | 483 |
| Jeff Olsen | 2012-2020 | .000 | 0 | 0 | 54 | 67 | 0 | 5.35 | 740 |
| Kevin Olsen | 2021-2023 | .234 | 35 | 128 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Olson | 2015-2019 | .319 | 22 | 179 | 0 | 0 | 0 | 0.00 | 0 |
| Guillermo Olvera | 2019-2022 | .240 | 6 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Olvera | 2022-2023 | .000 | 0 | 0 | 6 | 14 | 0 | 6.37 | 119 |
| Taro Omori | 2017-2027 | .277 | 9 | 131 | 0 | 0 | 0 | 0.00 | 0 |
| Chong-Duy Ong | 2024-2027 | .298 | 17 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Katsumi Onishi | 2017-2027 | .000 | 0 | 0 | 20 | 23 | 101 | 3.99 | 385 |
| Takao Onishi | 2018-2023 | .000 | 0 | 0 | 35 | 35 | 3 | 5.21 | 516 |
| Yasukazu Onishi | 2020-2021 | .210 | 2 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Mitsuhide Ono | 2018-2023 | .000 | 0 | 0 | 36 | 40 | 0 | 5.92 | 422 |
| Tsurayuki Ono | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 0 | 4.40 | 23 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Yasujiro Ono | 2017-2022 | .000 | 0 | 0 | 9 | 7 | 33 | 2.66 | 140 |
| Ramon Ooyendijk | 2022-2027 | .308 | 28 | 188 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Oram | 2018-2024 | .241 | 6 | 51 | 13 | 9 | 4 | 4.94 | 183 |
| Giuseppe Orati | 2025-2027 | .000 | 0 | 0 | 15 | 8 | 18 | 4.33 | 277 |
| Pedro Ornelas | 2014-2019 | .298 | 29 | 199 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Orozco | 2018-2026 | .297 | 102 | 431 | 0 | 0 | 0 | 0.00 | 0 |
| Andrés Ortega | 2016-2021 | .214 | 36 | 204 | 0 | 0 | 0 | 0.00 | 0 |
| Eduardo Ortega | 2021-2021 | .000 | 0 | 0 | 1 | 0 | 0 | 7.94 | 5 |
| Gustavo Ortega | 2027-2027 | .000 | 0 | 0 | 8 | 11 | 0 | 5.04 | 104 |
| Lorenzo Ortega | 2024-2027 | .000 | 0 | 0 | 7 | 3 | 2 | 3.67 | 68 |
| Manuel Ortega | 2019-2026 | .282 | 1 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Ramiro Ortega | 2012-2022 | .000 | 0 | 1 | 3 | 7 | 18 | 2.86 | 99 |
| Sancho Ortega | 2026-2027 | .000 | 0 | 0 | 3 | 2 | 1 | 5.82 | 45 |
| Adrián Ortíz | 2017-2027 | .310 | 40 | 328 | 0 | 0 | 0 | 0.00 | 0 |
| Alejandro Ortíz | 2020-2024 | .279 | 7 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Ortíz | 2023-2027 | .230 | 26 | 121 | 0 | 0 | 0 | 0.00 | 0 |
| Félix Ortíz | 2018-2024 | .000 | 0 | 0 | 22 | 14 | 56 | 2.92 | 226 |
| Fernando Ortíz | 2027-2027 | .307 | 4 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Javier Ortíz | 2022-2026 | .252 | 58 | 188 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortíz | 2019-2027 | .000 | 0 | 0 | 5 | 9 | 8 | 4.35 | 82 |
| Jorge Ortíz | 2024-2024 | .050 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Ortíz | 2017-2023 | .000 | 0 | 0 | 41 | 30 | 0 | 4.26 | 631 |
| Juan Ortíz | 2022-2027 | .259 | 50 | 155 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2018-2021 | .000 | 0 | 0 | 6 | 15 | 0 | 8.54 | 115 |
| Juan Carlos Ortíz | 2015-2019 | .307 | 7 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Manuel Ortíz | 2024-2027 | .296 | 6 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Orlando Ortíz | 2016-2024 | .255 | 72 | 307 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortíz | 2014-2021 | .000 | 0 | 0 | 12 | 10 | 7 | 5.21 | 238 |
| Rafael Ortíz | 2022-2023 | .270 | 9 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Salvador Ortíz | 2023-2027 | .246 | 38 | 212 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Sergio Ortíz | 2018-2020 | .000 | 0 | 0 | 0 | 0 | 1 | 8.10 | 9 |
| Conrad Orton | 2018-2023 | .000 | 0 | 0 | 12 | 30 | 48 | 5.38 | 265 |
| Don Orton | 2019-2026 | .311 | 17 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Osborn | 2016-2023 | .258 | 15 | 141 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Osborne | 2015-2022 | .000 | 0 | 0 | 14 | 14 | 2 | 4.52 | 211 |
| Ayan Osewe | 2026-2026 | .000 | 0 | 0 | 1 | 2 | 0 | 4.18 | 21 |
| Joe Osler | 2024-2027 | .268 | 17 | 183 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Ospira | 2019-2027 | .288 | 21 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Sal Ostendorff | 2021-2022 | .353 | 24 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Makoto Ota | 2018-2023 | .261 | 47 | 211 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Otero | 2026-2027 | .000 | 0 | 0 | 2 | 1 | 2 | 3.25 | 56 |
| Vicente Otero | 2018-2024 | .000 | 0 | 0 | 12 | 15 | 92 | 3.37 | 208 |
| Mitsuzuka Otsuka | 2021-2027 | .300 | 25 | 128 | 0 | 0 | 0 | 0.00 | 0 |
| Guonçalo Otto | 2019-2021 | .000 | 0 | 0 | 2 | 3 | 0 | 6.90 | 63 |
| Mei Ou-yang | 2020-2026 | .230 | 13 | 98 | 0 | 0 | 0 | 0.00 | 0 |
| Ger Oude Nijhuis | 2024-2027 | .000 | 0 | 0 | 21 | 12 | 25 | 5.35 | 239 |
| Tu-an Ow-Yang | 2025-2025 | .000 | 0 | 0 | 0 | 0 | 0 | 27.00 | 3 |
| Yin-ti Ow-Yang | 2026-2026 | .000 | 0 | 0 | 2 | 1 | 0 | 3.39 | 78 |
| Woody Owen | 2016-2023 | .000 | 0 | 0 | 36 | 19 | 0 | 3.97 | 468 |
| Dominic Owens | 2018-2027 | .368 | 30 | 327 | 0 | 0 | 0 | 0.00 | 0 |
| Jacob Owens | 2012-2022 | .000 | 0 | 0 | 5 | 4 | 0 | 4.80 | 111 |
| Nathan Owens | 2017-2022 | .000 | 0 | 0 | 1 | 2 | 0 | 6.89 | 45 |
| Tom Owens | 2019-2019 | .000 | 0 | 0 | 0 | 1 | 0 | 9.00 | 5 |
| Tom Owens | 2013-2018 | .000 | 0 | 0 | 17 | 8 | 0 | 3.16 | 174 |
| Harumi Oyama | 2027-2027 | .188 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Ikki Ozaki | 2025-2027 | .248 | 5 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Kichibei Ozawa | 2026-2027 | .000 | 0 | 0 | 12 | 6 | 0 | 4.71 | 176 |
