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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 |
|---|---|---|---|---|---|---|---|---|---|
| George O'Brien | 1903-1907 | .294 | 13 | 256 | 0 | 0 | 0 | 0.00 | 0 |
| Cyclone O'Donnell | 1903-1907 | .181 | 0 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Ernest Oake | 1904-1905 | .000 | 0 | 0 | 1 | 1 | 2 | 4.91 | 4 |
| George Oldfield | 1903-1907 | .210 | 1 | 46 | 85 | 71 | 0 | 2.49 | 819 |
| Ed Oliver | 1906-1907 | .245 | 1 | 1 | 15 | 7 | 8 | 1.64 | 109 |
| Joe Osborn | 1891-1900 | .314 | 23 | 473 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Osborn | 1896-1907 | .278 | 34 | 503 | 0 | 0 | 0 | 0.00 | 0 |
| Alonzo Ott | 1903-1907 | .257 | 0 | 4 | 9 | 12 | 0 | 2.30 | 88 |
| Shad Owens | 1897-1899 | .143 | 0 | 0 | 1 | 1 | 0 | 4.82 | 8 |
