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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Edan O'Carroll | 1913-1914 | 8 | 6 | .571 | 2.89 | 35 | 8 | 5 | 1 | 11 | 106.0 | 91 | 34 | 11 | 32 | 37 |
| Leo O'Neill | 1901-1902 | 30 | 25 | .545 | 4.46 | 68 | 60 | 35 | 2 | 1 | 496.0 | 601 | 246 | 31 | 130 | 95 |
| Thomas O'Reilly | 1901-1908 | 104 | 111 | .484 | 3.94 | 272 | 241 | 115 | 16 | 2 | 1891.2 | 1865 | 829 | 127 | 906 | 856 |
| Edan O'Sullivan | 1911-1914 | 2 | 2 | .500 | 2.55 | 5 | 5 | 0 | 0 | 0 | 35.1 | 37 | 10 | 3 | 7 | 33 |
| Ellis O'Sullivan | 1912-1914 | 7 | 11 | .389 | 4.53 | 29 | 25 | 2 | 0 | 0 | 161.0 | 188 | 81 | 25 | 70 | 52 |
| Scanlon O'Sullivan | 1901-1905 | 48 | 37 | .565 | 2.89 | 114 | 91 | 74 | 7 | 1 | 831.1 | 723 | 267 | 46 | 300 | 304 |
| Leo O'Toole | 1902-1908 | 4 | 2 | .667 | 3.34 | 39 | 0 | 0 | 0 | 1 | 67.1 | 78 | 25 | 3 | 41 | 23 |
| Hernán Ocampo | 1903-1913 | 180 | 159 | .531 | 3.05 | 435 | 335 | 205 | 25 | 30 | 2948.0 | 2631 | 998 | 157 | 757 | 2238 |
| Nereo Ocasio | 1907-1910 | 3 | 1 | .750 | 3.26 | 29 | 0 | 0 | 0 | 1 | 66.1 | 75 | 24 | 4 | 16 | 37 |
| José Ocon | 1914-1914 | 5 | 0 | 1.000 | 4.22 | 13 | 4 | 1 | 1 | 0 | 49.0 | 50 | 23 | 4 | 21 | 25 |
| Vladik Ofitserov | 1906-1911 | 92 | 43 | .681 | 2.18 | 151 | 143 | 102 | 19 | 1 | 1224.0 | 1041 | 297 | 60 | 191 | 767 |
| Cristóbal Ojeda | 1911-1914 | 30 | 35 | .462 | 3.11 | 78 | 77 | 47 | 7 | 0 | 625.2 | 568 | 216 | 54 | 140 | 475 |
| Jiyuu Okada | 1913-1914 | 2 | 5 | .286 | 7.39 | 12 | 11 | 1 | 0 | 0 | 70.2 | 84 | 58 | 17 | 48 | 45 |
| Onitunde Oladeji | 1913-1914 | 17 | 16 | .515 | 3.73 | 36 | 36 | 23 | 4 | 0 | 296.2 | 292 | 123 | 27 | 88 | 157 |
| Olamilekan Olatunji | 1913-1914 | 2 | 6 | .250 | 4.50 | 14 | 6 | 3 | 1 | 0 | 60.0 | 62 | 30 | 7 | 32 | 24 |
| Avelino Oliva | 1902-1910 | 120 | 110 | .522 | 3.05 | 248 | 246 | 174 | 18 | 0 | 2059.1 | 2114 | 698 | 109 | 352 | 1017 |
| Fructuoso Olivares | 1914-1914 | 1 | 0 | 1.000 | 3.38 | 5 | 0 | 0 | 0 | 0 | 2.2 | 5 | 1 | 0 | 0 | 0 |
| Próspero Olivas | 1914-1914 | 0 | 1 | .000 | 3.83 | 12 | 2 | 0 | 0 | 2 | 47.0 | 56 | 20 | 5 | 14 | 23 |
| Báquides Orellana | 1913-1913 | 1 | 2 | .333 | 3.58 | 10 | 0 | 0 | 0 | 0 | 32.2 | 33 | 13 | 5 | 10 | 20 |
| Ordoño Ortega | 1904-1912 | 153 | 103 | .598 | 2.72 | 276 | 264 | 209 | 24 | 0 | 2276.1 | 2179 | 689 | 112 | 285 | 767 |
| Timoteo Ortega | 1907-1913 | 82 | 49 | .626 | 3.25 | 173 | 139 | 81 | 14 | 5 | 1239.2 | 1151 | 447 | 110 | 292 | 942 |
| Adelino Ortiz | 1911-1914 | 26 | 34 | .433 | 3.49 | 80 | 76 | 22 | 3 | 0 | 574.1 | 542 | 223 | 39 | 196 | 313 |
| Carlos Ortiz | 1910-1910 | 1 | 0 | 1.000 | 0.00 | 1 | 1 | 1 | 1 | 0 | 9.0 | 6 | 0 | 0 | 0 | 5 |
| Juan Ortiz | 1907-1910 | 32 | 34 | .485 | 3.83 | 94 | 74 | 21 | 5 | 0 | 611.0 | 580 | 260 | 47 | 202 | 259 |
| Juan Ortiz | 1911-1913 | 23 | 19 | .548 | 3.87 | 52 | 50 | 16 | 5 | 0 | 356.0 | 394 | 153 | 25 | 127 | 204 |
| Tito Ortiz | 1906-1911 | 27 | 18 | .600 | 2.50 | 225 | 0 | 0 | 0 | 58 | 403.2 | 344 | 112 | 16 | 104 | 336 |
| Zabulón Ortiz | 1905-1910 | 0 | 2 | .000 | 2.84 | 14 | 0 | 0 | 0 | 0 | 38.0 | 30 | 12 | 0 | 14 | 19 |
| Induciomaro Osorio | 1913-1913 | 0 | 0 | .000 | 2.16 | 3 | 0 | 0 | 0 | 0 | 8.1 | 8 | 2 | 1 | 1 | 7 |
| Luis Otero | 1911-1911 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 0 | 0 | 0 | 0 | 0 |
