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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 |
|---|---|---|---|---|---|---|---|---|---|
| Seung-gwan O | 2051-2051 | .294 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Lloyd O'Brian | 2026-2028 | .260 | 14 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| William O'Brien | 2043-2043 | .000 | 0 | 0 | 3 | 4 | 5 | 6.00 | 25 |
| Dave O'Cosgrove | 2044-2045 | .000 | 0 | 0 | 4 | 2 | 3 | 3.53 | 43 |
| Alan O'Criodan | 2045-2048 | .000 | 0 | 0 | 7 | 9 | 1 | 5.65 | 158 |
| Ben O'Farrell | 2027-2027 | .240 | 5 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Ken O'Farrell | 2048-2049 | .250 | 5 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Steve O'Feeny | 2033-2035 | .000 | 0 | 0 | 12 | 7 | 0 | 3.31 | 223 |
| Brett O'Halloran | 2023-2024 | .000 | 0 | 0 | 8 | 5 | 0 | 5.21 | 86 |
| Doug O'Halloran | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 6 |
| David O'Heydon | 2031-2034 | .000 | 0 | 0 | 2 | 0 | 0 | 1.10 | 10 |
| Justin O'Higgins | 2051-2051 | .335 | 7 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Caleb O'Keefe | 2027-2028 | .279 | 12 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| Tracy O'Keiran | 2027-2027 | .211 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Scott O'Larissey | 2026-2026 | .000 | 0 | 0 | 8 | 3 | 4 | 4.23 | 53 |
| Ron O'Molony | 2046-2046 | .186 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Chris O'Neal | 2047-2051 | .284 | 2 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Elliott O'Rorke | 2046-2049 | .000 | 0 | 0 | 11 | 11 | 17 | 3.08 | 164 |
| Randy O'Rorke | 2040-2042 | .246 | 4 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Ricky O'Rourke | 2041-2042 | .254 | 5 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Brent O'Sheill | 2047-2049 | .239 | 7 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Dave O'Toole | 2047-2047 | .208 | 0 | 1 | 0 | 5 | 0 | 9.13 | 16 |
| Jimmy Ocasio | 2049-2051 | .188 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Héctor Oditón | 2036-2040 | .274 | 4 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Shinobu Ogawa | 2048-2049 | .192 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Oglethorpe | 2032-2033 | .230 | 3 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Hirotada Ohayashi | 2050-2051 | .000 | 0 | 0 | 0 | 0 | 0 | 2.22 | 29 |
| Kosaku Ohayashi | 2047-2047 | .356 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Matsudaira Ohayashi | 2050-2051 | .000 | 0 | 0 | 1 | 2 | 0 | 5.96 | 58 |
| Yasuo Oike | 2050-2050 | .209 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Takamori Okimasa | 2046-2046 | .221 | 1 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Bryan Olivares | 2048-2051 | .000 | 0 | 0 | 18 | 18 | 1 | 5.29 | 283 |
| Luis Olivares | 2047-2047 | .000 | 0 | 0 | 5 | 6 | 0 | 5.36 | 98 |
| Ramiro Olivares | 2051-2051 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Rob Olivarez | 2030-2030 | .000 | 0 | 0 | 1 | 0 | 0 | 9.00 | 1 |
| Daniel Oliver | 2048-2051 | .000 | 0 | 0 | 18 | 12 | 0 | 3.41 | 376 |
| Richard Olson | 2030-2031 | .193 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Jorge Olvera | 2049-2051 | .000 | 0 | 0 | 1 | 0 | 0 | 1.44 | 30 |
| Motonobu Omori | 2051-2051 | .000 | 0 | 0 | 8 | 4 | 0 | 2.47 | 93 |
| Min-gook Ong | 2042-2043 | .000 | 0 | 0 | 9 | 8 | 15 | 2.60 | 159 |
| Yukio Ono | 2034-2038 | .211 | 10 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Javier Ontiveros | 2050-2050 | .000 | 0 | 0 | 5 | 0 | 0 | 3.99 | 43 |
| Álex Ortega | 2050-2050 | .353 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Arturo Ortíz | 2041-2041 | .000 | 0 | 0 | 6 | 3 | 9 | 2.34 | 135 |
| Dave Ortíz | 2045-2050 | .232 | 12 | 71 | 0 | 0 | 0 | 0.00 | 0 |
| Edgar Ortíz | 2046-2047 | .180 | 5 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Eugene Ortíz | 2038-2038 | .288 | 10 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Ortíz | 2027-2027 | .000 | 0 | 0 | 1 | 2 | 0 | 2.37 | 16 |
| Jorge Ortíz | 2050-2051 | .000 | 0 | 0 | 3 | 0 | 5 | 3.52 | 34 |
| Josh Ortíz | 2047-2051 | .227 | 9 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortíz | 2051-2051 | .000 | 0 | 0 | 1 | 3 | 1 | 2.45 | 47 |
| Júlio Ortíz | 2048-2049 | .000 | 0 | 0 | 8 | 5 | 0 | 4.09 | 153 |
| Nelson Ortíz | 2046-2046 | .274 | 1 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Roberto Ortíz | 2038-2039 | .249 | 2 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Sixto Ortíz | 2043-2043 | .231 | 7 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Ortíz | 2051-2051 | .150 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Tulio Ortíz | 2033-2036 | .274 | 17 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Walt Ortíz | 2042-2043 | .236 | 10 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Shogo Osada | 2048-2048 | .307 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Andrew Osborne | 2047-2049 | .203 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Phillip Osborne | 2048-2048 | .301 | 3 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Diego Otero | 2048-2049 | .208 | 1 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Felipe Otero | 2051-2051 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Nobuatsu Otsuka | 2049-2049 | .242 | 1 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Lienhard Overresch | 2027-2027 | .253 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Dave Overton | 2043-2044 | .247 | 5 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Larry Owen | 2048-2049 | .209 | 17 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Owen | 2026-2027 | .000 | 0 | 0 | 7 | 2 | 0 | 3.26 | 71 |
| Tom Owen | 2039-2041 | .279 | 11 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Brett Owens | 2051-2051 | .237 | 2 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Henry Owens | 2034-2034 | .000 | 0 | 0 | 1 | 0 | 4 | 0.00 | 8 |
| Jesse Owens | 2048-2050 | .286 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Owens | 2047-2048 | .254 | 5 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Owens | 2029-2030 | .261 | 6 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Yorikane Oyama | 2032-2032 | .353 | 9 | 64 | 0 | 0 | 0 | 0.00 | 0 |
| Kinji Ozaki | 2042-2042 | .303 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
