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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 |
|---|---|---|---|---|---|---|---|---|---|
| Donnell O'Brien | 1890-1897 | .188 | 3 | 62 | 130 | 108 | 0 | 3.16 | 790 |
| Donal O'Connor | 1890-1897 | .261 | 9 | 264 | 0 | 0 | 0 | 0.00 | 0 |
| Flannan O'Connor | 1890-1891 | .252 | 3 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Shanley O'Connor | 1891-1897 | .264 | 27 | 355 | 0 | 0 | 0 | 0.00 | 0 |
| Féilim O'Doherty | 1890-1897 | .271 | 21 | 275 | 0 | 0 | 0 | 0.00 | 0 |
| Kyne O'Doherty | 1890-1897 | .200 | 5 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Wally O'Doherty | 1890-1891 | .171 | 0 | 4 | 8 | 10 | 4 | 2.98 | 94 |
| Hagen O'Farrell | 1890-1894 | .245 | 2 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Moriarty O'Farrell | 1890-1891 | .053 | 0 | 0 | 2 | 3 | 0 | 2.51 | 27 |
| Breck O'Neill | 1890-1891 | .275 | 0 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Leo O'Neill | 1890-1891 | .151 | 0 | 11 | 21 | 30 | 0 | 3.16 | 220 |
| Micah O'Neill | 1891-1894 | .226 | 10 | 79 | 0 | 0 | 0 | 0.00 | 0 |
| Charlie O'Reilly | 1891-1897 | .229 | 8 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Nick O'Sullivan | 1891-1893 | .260 | 2 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Alistair Oakley | 1892-1897 | .190 | 0 | 60 | 156 | 69 | 0 | 2.17 | 1288 |
| Servio Olvera | 1893-1897 | .130 | 2 | 20 | 57 | 96 | 0 | 3.86 | 797 |
| Riordan Orr | 1890-1897 | .246 | 19 | 198 | 0 | 0 | 0 | 0.00 | 0 |
| Bernabé Ortiz | 1894-1895 | .262 | 0 | 10 | 18 | 20 | 0 | 4.97 | 112 |
| Rodrigo Ortiz | 1895-1897 | .257 | 1 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Alastair Owen | 1897-1897 | .240 | 8 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Shea Owen | 1890-1897 | .170 | 8 | 116 | 0 | 0 | 0 | 0.00 | 0 |
