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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 |
|---|---|---|---|---|---|---|---|---|---|
| José María Jacobo | 1910-1910 | .129 | 0 | 1 | 3 | 6 | 0 | 4.30 | 60 |
| Abdón Jara | 1901-1907 | .272 | 25 | 256 | 0 | 0 | 0 | 0.00 | 0 |
| Delfín Jaramillo | 1903-1905 | .100 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Enrique Jaramillo | 1904-1909 | .231 | 0 | 2 | 1 | 3 | 0 | 3.54 | 29 |
| Fernando Jaramillo | 1906-1914 | .238 | 5 | 262 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Jaramillo | 1901-1910 | .269 | 15 | 438 | 0 | 0 | 0 | 0.00 | 0 |
| Glauco Jaso | 1908-1910 | .125 | 2 | 3 | 2 | 5 | 0 | 5.50 | 23 |
| Bolívar Jiménez | 1907-1907 | .105 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ireneo Jiménez | 1901-1904 | .141 | 0 | 6 | 11 | 18 | 0 | 2.97 | 66 |
| José Jiménez | 1901-1914 | .270 | 7 | 175 | 0 | 0 | 0 | 0.00 | 0 |
| Noé Jiménez | 1908-1910 | .000 | 0 | 0 | 1 | 1 | 0 | 2.81 | 9 |
| Práxedes Jiménez | 1905-1906 | .000 | 0 | 1 | 1 | 0 | 0 | 0.00 | 6 |
| Radamés Jiménez | 1901-1906 | .172 | 0 | 19 | 33 | 37 | 1 | 3.24 | 226 |
| Roberto Jiménez | 1907-1912 | .190 | 3 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Zacarías Jiménez | 1910-1915 | .093 | 1 | 15 | 57 | 45 | 11 | 2.62 | 513 |
| Andreas Johnson | 1907-1915 | .265 | 7 | 319 | 0 | 0 | 0 | 0.00 | 0 |
| Scanlon Johnson | 1907-1907 | .000 | 0 | 0 | 0 | 0 | 0 | 17.47 | 0 |
| Stan Joly | 1914-1915 | .167 | 0 | 0 | 0 | 1 | 1 | 3.60 | 8 |
| Ryan Joseph | 1903-1907 | .070 | 0 | 6 | 66 | 42 | 6 | 1.89 | 489 |
| Paulino Jurado | 1908-1915 | .285 | 7 | 363 | 0 | 0 | 0 | 0.00 | 0 |
| Fulco Juárez | 1902-1915 | .249 | 6 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Germán Juárez | 1911-1911 | .182 | 0 | 1 | 1 | 3 | 0 | 2.84 | 15 |
| Luis Juárez | 1903-1915 | .232 | 4 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Saturnín Juárez | 1912-1915 | .120 | 0 | 6 | 29 | 44 | 0 | 3.02 | 381 |
