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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-mok O | 2041-2041 | .000 | 0 | 0 | 1 | 0 | 0 | 9.35 | 29 |
| George O'Connor | 2040-2040 | .000 | 0 | 0 | 1 | 0 | 0 | 6.23 | 4 |
| Thad O'Day | 2037-2037 | .148 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Barry O'Quinn | 2054-2057 | .275 | 12 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Danny O'Reilly | 2038-2038 | .000 | 0 | 0 | 5 | 11 | 0 | 4.41 | 95 |
| Jonathon O'Reilly | 2048-2051 | .215 | 12 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Yellel Obataiye | 2055-2056 | .000 | 0 | 0 | 0 | 4 | 0 | 5.01 | 31 |
| Vicente Ocasio | 2047-2047 | .000 | 0 | 0 | 2 | 0 | 0 | 8.64 | 30 |
| Higino Ocha | 2040-2040 | .265 | 0 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Damon Odgers | 2043-2046 | .000 | 0 | 0 | 4 | 5 | 3 | 4.21 | 49 |
| Masahiro Ogawa | 2039-2044 | .000 | 0 | 0 | 14 | 15 | 5 | 5.14 | 343 |
| Hisaki Ogusuku | 2039-2040 | .208 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Sadaharu Oh III | 2043-2047 | .304 | 163 | 454 | 0 | 0 | 0 | 0.00 | 0 |
| Ryutaro Ohayashi | 2039-2039 | .299 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ojito | 2038-2042 | .258 | 30 | 140 | 0 | 0 | 0 | 0.00 | 0 |
| Naruhiko Okada | 2054-2057 | .204 | 7 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Yasuoka Okamura | 2043-2043 | .000 | 0 | 0 | 1 | 0 | 0 | 3.63 | 14 |
| Yoriie Okazaki | 2037-2039 | .000 | 0 | 0 | 0 | 3 | 0 | 12.34 | 9 |
| Bin Okorafor | 2047-2047 | .167 | 4 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| José Oliva | 2057-2057 | .000 | 0 | 0 | 3 | 2 | 0 | 5.04 | 16 |
| Luis Oliva | 2046-2048 | .000 | 0 | 0 | 6 | 10 | 2 | 4.74 | 164 |
| José Olivarez | 2039-2045 | .327 | 57 | 329 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Olivarez | 2047-2049 | .000 | 0 | 0 | 5 | 1 | 0 | 4.54 | 111 |
| José Olivas | 2043-2048 | .000 | 0 | 0 | 12 | 19 | 0 | 6.34 | 158 |
| Logan Olivas | 2037-2040 | .312 | 0 | 0 | 12 | 14 | 1 | 4.40 | 213 |
| Jason Oliver | 2038-2038 | .286 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Liam Oliver | 2043-2045 | .234 | 5 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Randy Oliver | 2037-2041 | .333 | 0 | 0 | 13 | 20 | 6 | 4.14 | 180 |
| Tim Oliver | 2038-2041 | .000 | 0 | 0 | 15 | 13 | 1 | 4.56 | 209 |
| Émile Ollier | 2050-2055 | .296 | 58 | 207 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Jorge Olvera | 2046-2048 | .000 | 0 | 0 | 0 | 5 | 3 | 4.85 | 78 |
| José Olvera | 2038-2041 | .000 | 0 | 0 | 35 | 20 | 2 | 4.06 | 251 |
| Alonso Olvere | 2042-2045 | .290 | 45 | 160 | 0 | 0 | 0 | 0.00 | 0 |
| Ostoja Omeragic | 2055-2058 | .000 | 0 | 0 | 15 | 13 | 1 | 4.01 | 175 |
| Slobodan Omeragic | 2049-2050 | .000 | 0 | 0 | 10 | 22 | 0 | 4.64 | 245 |
| Abay Omoruyi | 2043-2043 | .275 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Saed Onindo | 2049-2050 | .148 | 3 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Katsumi Ono | 2044-2046 | .243 | 7 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Shihi Onodera | 2040-2040 | .000 | 0 | 0 | 0 | 0 | 0 | 6.98 | 19 |
| Jacob Oort | 2046-2055 | .000 | 0 | 0 | 55 | 39 | 1 | 3.78 | 550 |
| Alfonso Ordóñez | 2037-2037 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Octávio Ordóñez | 2050-2051 | .151 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Arturo Ornelas | 2043-2045 | .000 | 0 | 0 | 5 | 4 | 3 | 3.76 | 163 |
| Zephyr Orphanides | 2045-2058 | .292 | 232 | 941 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2044-2045 | .243 | 6 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| José Ortega | 2039-2039 | .274 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Ricardo Ortega | 2043-2043 | .000 | 0 | 0 | 4 | 8 | 1 | 5.96 | 67 |
| Ricardo Ortega | 2043-2043 | .252 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Alejandro Ortíz | 2052-2052 | .263 | 16 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| António Ortíz | 2037-2041 | .237 | 13 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Bartolo Ortíz | 2048-2051 | .268 | 44 | 130 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Ortíz | 2038-2040 | .000 | 0 | 0 | 3 | 3 | 4 | 5.68 | 59 |
| Fernando Ortíz | 2038-2041 | .240 | 24 | 110 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Ortíz | 2048-2050 | .000 | 0 | 0 | 1 | 7 | 0 | 5.25 | 32 |
| Jorge Ortíz | 2038-2043 | .000 | 0 | 0 | 49 | 34 | 10 | 4.76 | 368 |
| Juan Ortíz | 2046-2046 | .188 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2042-2045 | .000 | 0 | 0 | 10 | 17 | 7 | 5.37 | 147 |
| Juan Carlos Ortíz | 2039-2046 | .256 | 20 | 195 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ortíz | 2046-2047 | .000 | 0 | 0 | 11 | 25 | 0 | 5.68 | 208 |
| Miguel Ortíz | 2043-2044 | .262 | 32 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Pedro Ortíz | 2049-2050 | .000 | 0 | 0 | 15 | 13 | 0 | 3.91 | 137 |
| Raymond Ortíz | 2047-2048 | .000 | 0 | 0 | 4 | 12 | 0 | 6.52 | 67 |
| Ricardo Ortíz | 2042-2042 | .000 | 0 | 0 | 1 | 2 | 4 | 6.88 | 78 |
| Abdel Osagboro | 2044-2045 | .236 | 9 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Negussu Osahar | 2055-2057 | .000 | 0 | 0 | 15 | 14 | 0 | 4.72 | 221 |
| Hiroyasu Osaragi | 2039-2041 | .000 | 0 | 0 | 10 | 13 | 0 | 5.46 | 214 |
| Louis Oshin | 2041-2042 | .227 | 4 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Ricardo Osorio | 2053-2053 | .160 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Otero | 2052-2055 | .250 | 36 | 182 | 0 | 0 | 0 | 0.00 | 0 |
| Domingas Ottolini | 2042-2044 | .338 | 23 | 81 | 0 | 0 | 0 | 0.00 | 0 |
| Dean Oulton | 2038-2043 | .000 | 0 | 0 | 47 | 42 | 44 | 5.03 | 539 |
| Jeremy Owbridge | 2043-2052 | .261 | 117 | 616 | 0 | 0 | 0 | 0.00 | 0 |
| Chester Owens | 2037-2042 | .317 | 89 | 391 | 0 | 0 | 0 | 0.00 | 0 |
