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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 |
|---|---|---|---|---|---|---|---|---|---|
| Floyd O'Brien | 1907-1913 | .239 | 11 | 176 | 0 | 0 | 0 | 0.00 | 0 |
| Adam O'Connor | 1911-1913 | .229 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Allen O'Leary | 1906-1911 | .298 | 15 | 289 | 0 | 0 | 0 | 0.00 | 0 |
| Duggan Oates | 1904-1905 | .000 | 0 | 0 | 2 | 1 | 0 | 4.07 | 27 |
| Néstor Obando | 1906-1913 | .000 | 0 | 0 | 24 | 22 | 23 | 4.48 | 229 |
| José Ocampo | 1903-1913 | .000 | 0 | 0 | 211 | 130 | 28 | 2.53 | 1882 |
| Aimar Ochoa | 1907-1913 | .291 | 10 | 276 | 0 | 0 | 0 | 0.00 | 0 |
| Ronaldo Ochoa | 1906-1909 | .335 | 17 | 191 | 0 | 0 | 0 | 0.00 | 0 |
| Álvaro Ochoa | 1905-1913 | .254 | 6 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Arturo Oliva | 1912-1913 | .318 | 2 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Gustavo Oliva | 1903-1912 | .162 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Eufemio Olivares | 1903-1913 | .242 | 13 | 162 | 0 | 0 | 0 | 0.00 | 0 |
| Tadeo Olivares | 1911-1913 | .303 | 8 | 129 | 0 | 0 | 0 | 0.00 | 0 |
| Ubaldo Olivarez | 1913-1913 | .262 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Ernesto Olivera | 1913-1913 | .346 | 1 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Everardo Olquín | 1906-1913 | .000 | 0 | 0 | 55 | 96 | 8 | 4.27 | 659 |
| Édgar Oquendo | 1903-1910 | .260 | 26 | 144 | 0 | 0 | 0 | 0.00 | 0 |
| Enrique Orea | 1904-1913 | .254 | 11 | 229 | 0 | 0 | 0 | 0.00 | 0 |
| Pascual Orengo | 1907-1913 | .280 | 9 | 132 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Orozco | 1903-1910 | .000 | 0 | 0 | 88 | 61 | 19 | 2.87 | 898 |
| Hanrahan Orr | 1903-1904 | .280 | 6 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Peter Orr | 1908-1913 | .244 | 1 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Guiomar Ortega | 1911-1913 | .000 | 0 | 0 | 7 | 8 | 2 | 3.48 | 82 |
| Julián Ortega | 1903-1903 | .000 | 0 | 0 | 14 | 17 | 0 | 4.97 | 35 |
| Darío Ortiz | 1911-1912 | .545 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Germán Ortiz | 1903-1909 | .224 | 36 | 152 | 0 | 0 | 0 | 0.00 | 0 |
| Melquíades Ortiz | 1903-1913 | .000 | 0 | 0 | 20 | 14 | 33 | 2.41 | 134 |
| Pablo Ortiz | 1903-1913 | .263 | 9 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Ortiz | 1903-1903 | .000 | 0 | 0 | 7 | 25 | 0 | 4.51 | 25 |
| Fernando Oviedo | 1913-1913 | .286 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tubrady Owens | 1905-1913 | .269 | 26 | 326 | 0 | 0 | 0 | 0.00 | 0 |
| Andy Oyler | 1903-1913 | .249 | 41 | 150 | 0 | 0 | 0 | 0.00 | 0 |
