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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| José María Jacobo | 1910-1910 | 3 | 6 | .333 | 4.30 | 22 | 12 | 0 | 0 | 0 | 88.0 | 99 | 42 | 3 | 59 | 60 |
| Enrique Jaramillo | 1904-1909 | 1 | 3 | .250 | 3.54 | 19 | 0 | 0 | 0 | 0 | 48.1 | 44 | 19 | 1 | 42 | 29 |
| Glauco Jaso | 1908-1910 | 2 | 5 | .286 | 5.50 | 20 | 8 | 0 | 0 | 0 | 70.1 | 93 | 43 | 5 | 29 | 23 |
| Ireneo Jiménez | 1901-1904 | 11 | 18 | .379 | 2.97 | 40 | 31 | 14 | 1 | 0 | 248.1 | 235 | 82 | 9 | 72 | 66 |
| Noé Jiménez | 1908-1910 | 1 | 1 | .500 | 2.81 | 12 | 0 | 0 | 0 | 0 | 16.0 | 13 | 5 | 0 | 10 | 9 |
| Práxedes Jiménez | 1905-1906 | 1 | 0 | 1.000 | 0.00 | 7 | 0 | 0 | 0 | 0 | 10.2 | 9 | 0 | 1 | 5 | 6 |
| Radamés Jiménez | 1901-1906 | 33 | 37 | .471 | 3.24 | 91 | 76 | 43 | 6 | 1 | 620.1 | 638 | 223 | 3 | 177 | 226 |
| Zacarías Jiménez | 1910-1915 | 57 | 45 | .559 | 2.62 | 189 | 106 | 24 | 8 | 11 | 925.0 | 800 | 269 | 16 | 278 | 513 |
| Scanlon Johnson | 1907-1907 | 0 | 0 | .000 | 17.47 | 3 | 0 | 0 | 0 | 0 | 5.2 | 15 | 11 | 2 | 6 | 0 |
| Stan Joly | 1914-1915 | 0 | 1 | .000 | 3.60 | 22 | 0 | 0 | 0 | 1 | 35.0 | 36 | 14 | 0 | 15 | 8 |
| Ryan Joseph | 1903-1907 | 66 | 42 | .611 | 1.89 | 155 | 111 | 63 | 13 | 6 | 985.1 | 790 | 207 | 10 | 196 | 489 |
| Germán Juárez | 1911-1911 | 1 | 3 | .250 | 2.84 | 9 | 4 | 1 | 0 | 0 | 38.0 | 38 | 12 | 2 | 21 | 15 |
| Saturnín Juárez | 1912-1915 | 29 | 44 | .397 | 3.02 | 129 | 113 | 6 | 0 | 0 | 762.2 | 761 | 256 | 31 | 214 | 381 |
