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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rick O'Brien | 1912-1912 | 3 | 4 | .429 | 2.95 | 11 | 7 | 1 | 1 | 0 | 61.0 | 66 | 20 | 4 | 26 | 28 |
| Glenn O'Connor | 1911-1914 | 0 | 5 | .000 | 5.52 | 17 | 3 | 0 | 0 | 1 | 60.1 | 72 | 37 | 7 | 36 | 42 |
| Evan O'Leary | 1906-1913 | 73 | 77 | .487 | 3.60 | 200 | 153 | 90 | 9 | 5 | 1337.0 | 1304 | 535 | 133 | 289 | 681 |
| Woody O'Reilly | 1913-1914 | 0 | 2 | .000 | 10.29 | 8 | 0 | 0 | 0 | 1 | 7.0 | 11 | 8 | 3 | 1 | 5 |
| Lindsay O'Tougher | 1913-1915 | 13 | 23 | .361 | 4.67 | 44 | 44 | 8 | 0 | 0 | 318.0 | 358 | 165 | 38 | 112 | 181 |
| Pedro Ochoa | 1913-1914 | 6 | 10 | .375 | 4.01 | 21 | 19 | 5 | 0 | 0 | 141.1 | 122 | 63 | 12 | 37 | 73 |
| Calvino Ojeda | 1901-1907 | 21 | 10 | .677 | 2.81 | 99 | 0 | 0 | 0 | 11 | 166.2 | 179 | 52 | 10 | 37 | 85 |
| Alberto Olea | 1909-1909 | 8 | 3 | .727 | 3.60 | 13 | 12 | 1 | 0 | 0 | 90.0 | 84 | 36 | 6 | 39 | 57 |
| Carlos Olguín | 1901-1905 | 46 | 36 | .561 | 3.51 | 117 | 84 | 54 | 10 | 3 | 783.2 | 779 | 306 | 56 | 228 | 351 |
| Avelino Oliva | 1912-1913 | 5 | 6 | .455 | 2.63 | 15 | 8 | 6 | 1 | 0 | 82.0 | 78 | 24 | 11 | 21 | 67 |
| Fructuoso Olivares | 1913-1915 | 0 | 1 | .000 | 6.23 | 6 | 0 | 0 | 0 | 0 | 13.0 | 10 | 9 | 3 | 11 | 12 |
| Próspero Olivas | 1912-1913 | 2 | 2 | .500 | 5.16 | 15 | 3 | 0 | 0 | 0 | 45.1 | 63 | 26 | 5 | 7 | 17 |
| Gustavo Olmo | 1901-1910 | 18 | 27 | .400 | 4.28 | 199 | 0 | 0 | 0 | 28 | 346.2 | 340 | 165 | 37 | 145 | 233 |
| Chris Olson | 1901-1914 | 16 | 18 | .471 | 5.09 | 236 | 0 | 0 | 0 | 5 | 549.2 | 642 | 311 | 56 | 318 | 288 |
| Heráclito Ornelas | 1904-1912 | 54 | 74 | .422 | 4.25 | 185 | 135 | 44 | 8 | 0 | 1121.1 | 1186 | 530 | 58 | 425 | 536 |
| Aimar Orozco | 1912-1914 | 5 | 5 | .500 | 5.87 | 43 | 0 | 0 | 0 | 3 | 87.1 | 108 | 57 | 9 | 44 | 44 |
| Guillermo Orozco | 1906-1915 | 50 | 31 | .617 | 2.83 | 281 | 0 | 0 | 0 | 60 | 426.1 | 405 | 134 | 37 | 127 | 334 |
| Luis Orozco | 1911-1914 | 7 | 13 | .350 | 4.22 | 53 | 0 | 0 | 0 | 5 | 89.2 | 70 | 42 | 18 | 18 | 95 |
| Senén Ortega | 1906-1912 | 35 | 20 | .636 | 1.94 | 219 | 2 | 1 | 1 | 82 | 324.0 | 251 | 70 | 22 | 58 | 299 |
| Timoteo Ortega | 1914-1914 | 4 | 3 | .571 | 4.52 | 12 | 7 | 3 | 0 | 1 | 61.2 | 68 | 31 | 4 | 20 | 59 |
| Adelino Ortiz | 1915-1915 | 3 | 10 | .231 | 3.96 | 27 | 15 | 2 | 0 | 1 | 127.1 | 138 | 56 | 8 | 55 | 90 |
| Daniel Ortiz | 1913-1915 | 26 | 28 | .481 | 4.27 | 78 | 76 | 12 | 1 | 0 | 539.0 | 563 | 256 | 51 | 223 | 297 |
| Eliezer Ortiz | 1915-1915 | 0 | 1 | .000 | 2.70 | 5 | 0 | 0 | 0 | 0 | 6.2 | 8 | 2 | 0 | 2 | 6 |
| Juan Ortiz | 1913-1915 | 32 | 26 | .552 | 3.48 | 76 | 74 | 17 | 3 | 0 | 537.2 | 552 | 208 | 30 | 192 | 345 |
| Víctor Manuel Ortiz | 1915-1915 | 0 | 1 | .000 | 6.00 | 1 | 1 | 1 | 0 | 0 | 9.0 | 9 | 6 | 1 | 2 | 5 |
| Julián Orúe | 1901-1911 | 90 | 186 | .326 | 4.23 | 359 | 313 | 148 | 13 | 1 | 2554.0 | 2916 | 1201 | 275 | 537 | 997 |
| Induciomaro Osorio | 1913-1913 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 1 | 0 | 0 | 0 | 1 |
| Curro Oviedo | 1907-1912 | 19 | 39 | .328 | 5.72 | 102 | 80 | 8 | 0 | 1 | 588.0 | 683 | 374 | 61 | 308 | 324 |
