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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 |
|---|---|---|---|---|---|---|---|---|---|
| John O'Brien | 1901-1906 | .271 | 18 | 111 | 0 | 0 | 0 | 0.00 | 0 |
| Uinsin O'Callaghan | 1913-1914 | .000 | 0 | 0 | 5 | 21 | 0 | 5.37 | 119 |
| Laoghaire O'Hara | 1911-1913 | .218 | 10 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Frazer O'Keeffe | 1913-1914 | .248 | 6 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Fred O'Neill | 1901-1902 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen O'Neill | 1912-1914 | .241 | 7 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Dermot O'Reilly | 1912-1914 | .233 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Woody O'Reilly | 1914-1914 | .000 | 0 | 0 | 0 | 0 | 0 | 7.11 | 4 |
| Fergal O'Sullivan | 1913-1914 | .282 | 2 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Kenzie O'Toole | 1914-1914 | .151 | 3 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Ratko Obrenovic | 1914-1914 | .255 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ocampo | 1904-1914 | .290 | 38 | 328 | 0 | 0 | 0 | 0.00 | 0 |
| Ordoño Ocasio | 1901-1903 | .197 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Tomás Ocasio | 1901-1910 | .271 | 24 | 333 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Ogas | 1914-1914 | .226 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Diógenes Olaeta | 1912-1912 | .182 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Avelino Oliva | 1914-1914 | .000 | 0 | 0 | 1 | 0 | 0 | 1.00 | 10 |
| Pitágoras Oliva | 1912-1913 | .287 | 4 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Jaime Olivares | 1911-1914 | .000 | 0 | 0 | 15 | 19 | 0 | 3.55 | 212 |
| Medardo Olivares | 1911-1913 | .259 | 6 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Ubaldo Olivarez | 1912-1912 | .308 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Bradley Oliver | 1912-1914 | .279 | 17 | 99 | 0 | 0 | 0 | 0.00 | 0 |
| Dunnagh Oliver | 1911-1911 | .263 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Gedeón Olivera | 1906-1914 | .246 | 81 | 390 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Oliveros | 1912-1914 | .272 | 16 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Ontiveros | 1913-1914 | .237 | 1 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Zabulón Orejel | 1901-1908 | .251 | 9 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Fermín Ornelas | 1913-1914 | .317 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Induciomaro Orona | 1901-1909 | .236 | 5 | 63 | 0 | 0 | 0 | 0.00 | 0 |
| Alejandro Orozco | 1901-1903 | .235 | 2 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Gaspar Orozco | 1901-1911 | .302 | 43 | 310 | 0 | 0 | 0 | 0.00 | 0 |
| Julián Orta | 1910-1914 | .000 | 0 | 0 | 1 | 0 | 0 | 1.24 | 24 |
| Ademar Ortega | 1909-1913 | .240 | 30 | 150 | 0 | 0 | 0 | 0.00 | 0 |
| Aristarco Ortega | 1906-1911 | .239 | 7 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Eufrasio Ortega | 1910-1912 | .250 | 8 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Propercio Ortega | 1901-1904 | .000 | 0 | 0 | 3 | 2 | 2 | 3.44 | 23 |
| Rubén Ortega | 1912-1914 | .239 | 9 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Ángel Ortega | 1906-1908 | .000 | 0 | 0 | 39 | 27 | 2 | 3.00 | 320 |
| Amérigo Ortiz | 1913-1913 | .111 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Eduino Ortiz | 1901-1909 | .239 | 4 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Fabián Ortiz | 1906-1911 | .215 | 4 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Felipe Ortiz | 1913-1914 | .000 | 0 | 0 | 14 | 17 | 0 | 3.26 | 153 |
| Hernán Ortiz | 1901-1907 | .000 | 0 | 0 | 53 | 41 | 4 | 3.59 | 299 |
| Illán Ortiz | 1901-1911 | .287 | 12 | 133 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Ortiz | 1914-1914 | .235 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Ortiz | 1905-1912 | .205 | 6 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Nuño Ortiz | 1901-1912 | .255 | 33 | 273 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortiz | 1901-1907 | .000 | 0 | 0 | 83 | 126 | 0 | 3.64 | 856 |
| Roberto Ortiz | 1901-1904 | .290 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Sócrates Ortiz | 1913-1914 | .225 | 8 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Oeke Otten | 1914-1914 | .273 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ovalle | 1901-1909 | .220 | 12 | 165 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Owen | 1914-1914 | .000 | 0 | 0 | 6 | 10 | 0 | 3.28 | 62 |
| Takenori Oyama | 1912-1914 | .289 | 0 | 7 | 0 | 0 | 0 | 0.00 | 0 |
