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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 |
|---|---|---|---|---|---|---|---|---|---|
| Mitch O'Leary | 1895-1899 | .207 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Sammie Oakes | 1902-1911 | .234 | 3 | 217 | 0 | 0 | 0 | 0.00 | 0 |
| Israel Ockendon | 1911-1911 | .259 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Joseph Ogle | 1910-1916 | .272 | 13 | 221 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Olander | 1895-1895 | .233 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Gardner Olbison | 1900-1907 | .276 | 1 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Connie Oldacres | 1896-1900 | .270 | 0 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| James Oldreave | 1916-1916 | .176 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| George Orman | 1895-1901 | .278 | 7 | 215 | 0 | 0 | 0 | 0.00 | 0 |
| Glen Orwell | 1903-1910 | .245 | 1 | 110 | 0 | 0 | 0 | 0.00 | 0 |
| James Osbert | 1914-1916 | .182 | 0 | 0 | 1 | 3 | 2 | 2.63 | 28 |
| Sylveste Osler | 1904-1912 | .159 | 0 | 0 | 15 | 9 | 5 | 2.51 | 64 |
| Ben Oswald | 1895-1896 | .231 | 0 | 9 | 11 | 6 | 0 | 3.64 | 20 |
| Elvin Outhwaite | 1908-1908 | .250 | 0 | 0 | 0 | 2 | 0 | 12.15 | 3 |
| John Outhwaite | 1911-1911 | .222 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Laurence Ovendon | 1906-1914 | .189 | 2 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Gennaro Overell | 1911-1916 | .259 | 8 | 172 | 3 | 4 | 0 | 2.78 | 21 |
| Vaughn Ovett | 1902-1914 | .264 | 8 | 245 | 0 | 0 | 0 | 0.00 | 0 |
| John Oxenden | 1901-1916 | .149 | 2 | 71 | 194 | 160 | 2 | 2.32 | 1845 |
