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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 |
|---|---|---|---|---|---|---|---|---|---|
| Sang-hyuk O | 2054-2054 | .276 | 15 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Sang-mok O | 2042-2044 | .000 | 0 | 0 | 1 | 0 | 0 | 6.99 | 59 |
| Jesse O'Brodar | 2041-2041 | .444 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Stanley O'Casey | 2042-2043 | .000 | 0 | 0 | 3 | 5 | 9 | 3.27 | 51 |
| George O'Connor | 2042-2044 | .000 | 0 | 0 | 14 | 11 | 1 | 4.78 | 236 |
| Mike O'Hanly | 2057-2057 | .327 | 17 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen O'Herlihy | 2047-2047 | .262 | 0 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Wade O'Herlihy | 2044-2044 | .202 | 6 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Darragh O'Loughlin | 2050-2050 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Barry O'Quinn | 2053-2053 | .323 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Micheal O'Rourke | 2044-2044 | .286 | 5 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Craig Obray | 2051-2051 | .000 | 0 | 0 | 1 | 3 | 0 | 5.34 | 30 |
| Sean Oby | 2047-2049 | .262 | 22 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Cisco Ocampo | 2046-2047 | .293 | 7 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Ocasio | 2046-2050 | .000 | 0 | 0 | 3 | 0 | 8 | 2.79 | 96 |
| Ramón Ochoa | 2042-2043 | .400 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Damon Odgers | 2041-2047 | .000 | 0 | 0 | 32 | 55 | 0 | 6.44 | 504 |
| Yukinaga Ogawa | 2041-2044 | .000 | 0 | 0 | 5 | 3 | 1 | 7.87 | 87 |
| Hisaki Ogusuku | 2041-2041 | .283 | 7 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Junji Ohayashi | 2049-2049 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Takeichi Ohayashi | 2048-2048 | .338 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Mitsuhide Oike | 2042-2046 | .000 | 0 | 0 | 6 | 4 | 4 | 3.70 | 136 |
| Jov Oizerman | 2052-2052 | .000 | 0 | 0 | 6 | 6 | 1 | 4.65 | 105 |
| Héctor Ojeda | 2051-2051 | .333 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Lorenzo Ojeda | 2058-2058 | .000 | 0 | 0 | 0 | 0 | 0 | 10.80 | 2 |
| Naruhiko Okada | 2054-2057 | .250 | 7 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Kyoichi Okamura | 2050-2051 | .249 | 30 | 103 | 0 | 0 | 0 | 0.00 | 0 |
| Akihiro Okawa | 2053-2055 | .256 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Amattaken Okoth | 2057-2057 | .000 | 0 | 0 | 1 | 1 | 0 | 12.10 | 7 |
| Manobu Okumura | 2058-2058 | .000 | 0 | 0 | 1 | 1 | 1 | 9.95 | 6 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Juan Olivarez | 2046-2050 | .000 | 0 | 0 | 12 | 16 | 59 | 4.67 | 165 |
| Javier Olivas | 2054-2057 | .000 | 0 | 0 | 17 | 10 | 7 | 3.67 | 214 |
| Logan Olivas | 2042-2042 | .000 | 0 | 0 | 5 | 1 | 0 | 3.44 | 49 |
| Liam Oliver | 2047-2047 | .294 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Oliver Oliver | 2046-2047 | .256 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| John Olivier | 2046-2046 | .000 | 0 | 0 | 0 | 0 | 0 | 6.30 | 24 |
| Sébastien Olivier | 2057-2057 | .000 | 0 | 0 | 1 | 3 | 2 | 1.74 | 40 |
| Émile Ollier | 2048-2049 | .333 | 23 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Mekonen Olubayo | 2054-2054 | .129 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Olvera | 2049-2049 | .000 | 0 | 0 | 3 | 4 | 21 | 2.51 | 57 |
| Alonso Olvere | 2045-2046 | .261 | 5 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Abdul-Shakur Omar | 2051-2051 | .000 | 0 | 0 | 3 | 1 | 0 | 4.50 | 18 |
| Ostoja Omeragic | 2052-2056 | .000 | 0 | 0 | 20 | 18 | 2 | 4.27 | 251 |
| Slobodan Omeragic | 2048-2048 | .000 | 0 | 0 | 1 | 0 | 0 | 4.91 | 14 |
| Abay Omoruyi | 2044-2045 | .156 | 4 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Saed Onindo | 2048-2052 | .175 | 5 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Katsumi Ono | 2043-2043 | .322 | 11 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Shimpei Ono | 2049-2050 | .000 | 0 | 0 | 17 | 13 | 0 | 3.35 | 167 |
| Shihi Onodera | 2044-2044 | .000 | 0 | 0 | 1 | 1 | 1 | 5.45 | 43 |
| Kaliu Oola | 2053-2054 | .000 | 0 | 0 | 0 | 1 | 1 | 5.84 | 50 |
| Jacob Oort | 2044-2055 | .000 | 0 | 0 | 3 | 1 | 0 | 2.74 | 17 |
| Juan Ordóñez | 2050-2056 | .000 | 0 | 0 | 19 | 4 | 1 | 3.45 | 275 |
| Octávio Ordóñez | 2047-2052 | .291 | 14 | 94 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Orpen | 2050-2050 | .220 | 10 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Zephyr Orphanides | 2045-2045 | .294 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2041-2041 | .262 | 9 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Ramón Ortega | 2043-2044 | .214 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ricardo Ortega | 2044-2044 | .000 | 0 | 0 | 5 | 4 | 0 | 5.33 | 60 |
| Ricardo Ortega | 2041-2041 | .268 | 11 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Brody Orton | 2047-2049 | .240 | 7 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Albert Ortíz | 2044-2044 | .239 | 16 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Ortíz | 2041-2042 | .000 | 0 | 0 | 2 | 2 | 4 | 6.46 | 74 |
| Fernando Ortíz | 2041-2041 | .000 | 0 | 0 | 3 | 0 | 14 | 3.22 | 20 |
| Francisco Ortíz | 2047-2047 | .000 | 0 | 0 | 10 | 14 | 0 | 4.42 | 119 |
| Iván Ortíz | 2042-2044 | .000 | 0 | 0 | 13 | 11 | 0 | 5.28 | 270 |
| José Ortíz | 2058-2058 | .000 | 0 | 0 | 0 | 0 | 1 | 2.37 | 21 |
| Juan Ortíz | 2045-2045 | .272 | 40 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2042-2042 | .000 | 0 | 0 | 0 | 0 | 1 | 3.75 | 15 |
| Manuel Ortíz | 2043-2044 | .284 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Román Ortíz | 2047-2047 | .000 | 0 | 0 | 2 | 2 | 1 | 7.59 | 26 |
| Abdel Osagboro | 2043-2043 | .269 | 14 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Negussu Osahar | 2048-2053 | .000 | 0 | 0 | 6 | 7 | 16 | 3.97 | 114 |
| Hiroyasu Osaragi | 2042-2043 | .000 | 0 | 0 | 7 | 13 | 1 | 6.28 | 184 |
| Luke Osborn | 2047-2049 | .000 | 0 | 0 | 10 | 26 | 0 | 5.50 | 221 |
| Shouket Osmani | 2051-2055 | .295 | 23 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Ricardo Osorio | 2050-2056 | .252 | 8 | 61 | 6 | 4 | 1 | 4.94 | 53 |
| Francisco Otero | 2056-2056 | .213 | 1 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Aydan Otto | 2052-2052 | .204 | 6 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Zhao-ying Ou | 2051-2058 | .000 | 0 | 0 | 12 | 9 | 0 | 2.81 | 156 |
| Jeremy Owbridge | 2043-2043 | .192 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Chester Owens | 2042-2042 | .358 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Ira Owens | 2058-2058 | .375 | 4 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Kei Ozaki | 2051-2051 | .000 | 0 | 0 | 1 | 0 | 0 | 5.02 | 18 |
