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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 |
|---|---|---|---|---|---|---|---|---|---|
| Frank Oberlin | 1936-1939 | .239 | 2 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Bruce Ogrodowski | 1934-1939 | .313 | 12 | 155 | 0 | 0 | 0 | 0.00 | 0 |
| Armando Ojeda | 1920-1931 | .273 | 1 | 32 | 51 | 34 | 21 | 3.13 | 440 |
| Ernest Oliver | 1937-1939 | .264 | 5 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| James Oliver | 1938-1939 | .325 | 2 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Pat Olsen | 1931-1931 | .000 | 0 | 0 | 0 | 0 | 0 | 1.08 | 2 |
| Rodrigo Orengo | 1934-1936 | .000 | 0 | 1 | 0 | 5 | 2 | 7.01 | 11 |
| Bryan Orozco | 1931-1938 | .154 | 0 | 1 | 20 | 22 | 31 | 3.84 | 139 |
| Rayner Ortega | 1931-1936 | .256 | 0 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Ortiz | 1938-1939 | .100 | 0 | 4 | 1 | 9 | 1 | 7.45 | 22 |
| Jose Ortiz | 1927-1939 | .284 | 12 | 117 | 0 | 0 | 0 | 0.00 | 0 |
| Earnest Osborne | 1938-1939 | .310 | 0 | 9 | 15 | 8 | 0 | 2.50 | 141 |
| R. Owen | 1927-1933 | .157 | 0 | 13 | 39 | 32 | 0 | 3.31 | 317 |
| Jack Owens | 1936-1939 | .298 | 5 | 70 | 0 | 0 | 0 | 0.00 | 0 |
