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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Odemar Jaarsma | 1908-1908 | 0 | 5 | .000 | 9.56 | 8 | 3 | 0 | 0 | 0 | 32.0 | 44 | 34 | 7 | 25 | 11 |
| José María Jacobo | 1904-1908 | 2 | 3 | .400 | 3.99 | 16 | 1 | 1 | 0 | 5 | 29.1 | 28 | 13 | 4 | 11 | 37 |
| Antonio Jaime | 1904-1904 | 15 | 7 | .682 | 2.26 | 24 | 23 | 21 | 4 | 0 | 211.0 | 168 | 53 | 13 | 71 | 144 |
| Raúl Jaramillo | 1906-1906 | 18 | 5 | .783 | 1.84 | 26 | 24 | 21 | 4 | 0 | 220.2 | 143 | 45 | 16 | 64 | 231 |
| Saturnín Jaramillo | 1908-1908 | 5 | 5 | .500 | 4.83 | 17 | 14 | 4 | 0 | 1 | 110.0 | 116 | 59 | 21 | 43 | 34 |
| Glauco Jaso | 1904-1906 | 32 | 41 | .438 | 3.69 | 86 | 71 | 61 | 5 | 1 | 628.2 | 520 | 258 | 110 | 262 | 540 |
| Rio Jenkins | 1907-1908 | 6 | 11 | .353 | 5.84 | 32 | 24 | 3 | 1 | 1 | 155.2 | 201 | 101 | 27 | 67 | 45 |
| Ananías Jiménez | 1904-1906 | 2 | 7 | .222 | 3.63 | 29 | 0 | 0 | 0 | 4 | 34.2 | 35 | 14 | 3 | 20 | 25 |
| Cleto Jiménez | 1906-1906 | 5 | 0 | 1.000 | 1.40 | 5 | 5 | 5 | 1 | 0 | 45.0 | 34 | 7 | 0 | 9 | 27 |
| Ernesto Jiménez | 1905-1908 | 1 | 1 | .500 | 5.46 | 15 | 0 | 0 | 0 | 3 | 28.0 | 38 | 17 | 3 | 9 | 24 |
| Espártaco Jiménez | 1904-1906 | 6 | 8 | .429 | 4.56 | 36 | 16 | 9 | 0 | 0 | 185.1 | 182 | 94 | 15 | 143 | 100 |
| Germán Jiménez | 1905-1905 | 1 | 0 | 1.000 | 2.70 | 1 | 1 | 1 | 0 | 0 | 10.0 | 9 | 3 | 0 | 2 | 3 |
| Jerónimo Jiménez | 1905-1906 | 19 | 20 | .487 | 4.06 | 49 | 45 | 23 | 4 | 0 | 345.2 | 329 | 156 | 50 | 131 | 179 |
| Jorge Jiménez | 1904-1906 | 9 | 8 | .529 | 2.45 | 47 | 4 | 0 | 0 | 5 | 99.1 | 77 | 27 | 6 | 38 | 80 |
| Laertes Jiménez | 1904-1906 | 15 | 31 | .326 | 6.32 | 83 | 61 | 14 | 4 | 1 | 393.0 | 394 | 276 | 43 | 316 | 295 |
| Leopoldo Jiménez | 1906-1906 | 4 | 3 | .571 | 4.46 | 15 | 10 | 3 | 0 | 2 | 74.2 | 68 | 37 | 10 | 34 | 37 |
| Propercio Jiménez | 1905-1908 | 36 | 32 | .529 | 4.31 | 110 | 87 | 33 | 7 | 6 | 670.2 | 697 | 321 | 99 | 247 | 372 |
| Ramón Jiménez | 1905-1908 | 1 | 1 | .500 | 3.41 | 19 | 0 | 0 | 0 | 1 | 34.1 | 26 | 13 | 2 | 8 | 39 |
| Zacarías Jiménez | 1904-1907 | 6 | 6 | .500 | 2.16 | 45 | 5 | 4 | 0 | 1 | 154.1 | 122 | 37 | 11 | 35 | 119 |
| Ángel Jiménez | 1905-1905 | 9 | 2 | .818 | 1.33 | 14 | 11 | 11 | 2 | 0 | 115.0 | 100 | 17 | 1 | 24 | 68 |
| Scanlon Johnson | 1908-1908 | 0 | 4 | .000 | 9.37 | 8 | 5 | 0 | 0 | 0 | 32.2 | 48 | 34 | 6 | 27 | 13 |
| Lyndon Jones | 1907-1908 | 15 | 28 | .349 | 5.12 | 46 | 44 | 13 | 0 | 0 | 311.0 | 376 | 177 | 44 | 124 | 74 |
| Nivens Jones | 1904-1906 | 12 | 16 | .429 | 2.90 | 53 | 31 | 18 | 3 | 0 | 307.1 | 280 | 99 | 17 | 133 | 167 |
| Daniel Juma | 1907-1908 | 2 | 6 | .250 | 2.71 | 35 | 2 | 1 | 0 | 9 | 73.0 | 83 | 22 | 6 | 27 | 49 |
| Germán Juárez | 1904-1906 | 33 | 17 | .660 | 2.31 | 66 | 49 | 35 | 4 | 2 | 451.1 | 380 | 116 | 18 | 163 | 327 |
| Ignacio Juárez | 1907-1908 | 6 | 8 | .429 | 5.56 | 31 | 12 | 4 | 0 | 5 | 113.1 | 148 | 70 | 18 | 57 | 29 |
