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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Uinsin O'Callaghan | 1913-1914 | 5 | 21 | .192 | 5.37 | 37 | 34 | 0 | 0 | 0 | 231.1 | 275 | 138 | 40 | 82 | 119 |
| Woody O'Reilly | 1914-1914 | 0 | 0 | .000 | 7.11 | 4 | 0 | 0 | 0 | 0 | 6.1 | 10 | 5 | 2 | 4 | 4 |
| Avelino Oliva | 1914-1914 | 1 | 0 | 1.000 | 1.00 | 1 | 1 | 1 | 0 | 0 | 9.0 | 6 | 1 | 1 | 0 | 10 |
| Jaime Olivares | 1911-1914 | 15 | 19 | .441 | 3.55 | 37 | 36 | 24 | 3 | 0 | 302.0 | 298 | 119 | 19 | 76 | 212 |
| Julián Orta | 1910-1914 | 1 | 0 | 1.000 | 1.24 | 10 | 3 | 0 | 0 | 0 | 36.1 | 33 | 5 | 0 | 10 | 24 |
| Propercio Ortega | 1901-1904 | 3 | 2 | .600 | 3.44 | 39 | 0 | 0 | 0 | 2 | 65.1 | 66 | 25 | 4 | 35 | 23 |
| Ángel Ortega | 1906-1908 | 39 | 27 | .591 | 3.00 | 75 | 67 | 51 | 6 | 2 | 579.0 | 518 | 193 | 28 | 153 | 320 |
| Felipe Ortiz | 1913-1914 | 14 | 17 | .452 | 3.26 | 40 | 38 | 12 | 1 | 0 | 300.2 | 286 | 109 | 29 | 70 | 153 |
| Hernán Ortiz | 1901-1907 | 53 | 41 | .564 | 3.59 | 162 | 93 | 55 | 7 | 4 | 908.2 | 1011 | 362 | 71 | 166 | 299 |
| Pedro Ortiz | 1901-1907 | 83 | 126 | .397 | 3.64 | 230 | 224 | 162 | 8 | 0 | 1885.2 | 1983 | 762 | 157 | 498 | 856 |
| Stephen Owen | 1914-1914 | 6 | 10 | .375 | 3.28 | 23 | 18 | 6 | 1 | 0 | 148.1 | 163 | 54 | 12 | 39 | 62 |
