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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 |
|---|---|---|---|---|---|---|---|---|---|
| Hagen O'Farrell | 1893-1893 | .300 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Domingo Oaxaca | 1884-1895 | .302 | 20 | 604 | 0 | 0 | 0 | 0.00 | 0 |
| Ismael Ochoa | 1895-1897 | .287 | 10 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Ochoa | 1883-1883 | .146 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Vicente Olguín | 1891-1897 | .287 | 23 | 298 | 0 | 0 | 0 | 0.00 | 0 |
| Sandalio Olivarez | 1894-1897 | .272 | 0 | 28 | 10 | 11 | 12 | 4.98 | 17 |
| Jaime Olivera | 1889-1897 | .300 | 7 | 488 | 0 | 0 | 0 | 0.00 | 0 |
| Ladislao Olivera | 1887-1889 | .176 | 0 | 7 | 13 | 17 | 3 | 5.67 | 58 |
| Gregorio Orantez | 1882-1896 | .214 | 0 | 81 | 109 | 153 | 0 | 3.89 | 737 |
| Hermenegildo Orona | 1882-1889 | .115 | 0 | 26 | 69 | 87 | 0 | 3.50 | 453 |
| Pandolfo Ortega | 1884-1897 | .236 | 5 | 91 | 160 | 79 | 9 | 2.86 | 896 |
| Santiago Ortega | 1885-1893 | .268 | 14 | 298 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Ortiz | 1885-1897 | .239 | 49 | 531 | 0 | 0 | 0 | 0.00 | 0 |
| Rafael Ortiz | 1893-1895 | .266 | 2 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Osorio | 1890-1890 | .213 | 3 | 29 | 0 | 0 | 0 | 0.00 | 0 |
