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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Saturnín Jaramillo | 1914-1915 | 1 | 1 | .500 | 7.52 | 6 | 3 | 1 | 0 | 0 | 26.1 | 34 | 22 | 4 | 13 | 13 |
| Ross Jefferson | 1901-1902 | 6 | 4 | .600 | 4.38 | 28 | 8 | 2 | 0 | 1 | 90.1 | 82 | 44 | 5 | 76 | 39 |
| Ray Jeffery | 1905-1915 | 22 | 19 | .537 | 4.14 | 217 | 0 | 0 | 0 | 15 | 380.2 | 424 | 175 | 38 | 125 | 241 |
| Rio Jenkins | 1914-1915 | 6 | 11 | .353 | 4.34 | 32 | 20 | 4 | 1 | 0 | 182.1 | 202 | 88 | 24 | 39 | 117 |
| Rick Jerome | 1912-1915 | 10 | 11 | .476 | 4.07 | 61 | 9 | 4 | 1 | 2 | 207.2 | 221 | 94 | 19 | 58 | 173 |
| Adrián Jiménez | 1901-1905 | 74 | 46 | .617 | 3.28 | 139 | 126 | 86 | 11 | 1 | 1064.2 | 1105 | 388 | 63 | 218 | 390 |
| Ananías Jiménez | 1907-1913 | 30 | 24 | .556 | 2.33 | 207 | 0 | 0 | 0 | 63 | 297.1 | 230 | 77 | 28 | 66 | 304 |
| Jorge Jiménez | 1913-1913 | 1 | 1 | .500 | 0.46 | 15 | 0 | 0 | 0 | 2 | 19.2 | 11 | 1 | 0 | 1 | 20 |
| Rosario Jiménez | 1901-1912 | 47 | 45 | .511 | 3.62 | 147 | 102 | 35 | 5 | 3 | 870.0 | 892 | 350 | 69 | 278 | 441 |
| Hubert Jirka | 1914-1914 | 0 | 1 | .000 | 10.12 | 1 | 0 | 0 | 0 | 0 | 2.2 | 2 | 3 | 0 | 2 | 1 |
| Matt Johnson | 1914-1914 | 5 | 3 | .625 | 2.32 | 26 | 0 | 0 | 0 | 4 | 50.1 | 46 | 13 | 3 | 10 | 27 |
| Daniel Juma | 1913-1915 | 18 | 14 | .562 | 3.16 | 35 | 34 | 28 | 3 | 0 | 305.0 | 264 | 107 | 23 | 90 | 260 |
| Willi Junker | 1913-1913 | 0 | 0 | .000 | 4.50 | 1 | 0 | 0 | 0 | 0 | 4.0 | 6 | 2 | 1 | 3 | 3 |
