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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 | 1914-1914 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.2 | 0 | 0 | 0 | 0 | 0 |
| Jack James | 1913-1914 | 10 | 9 | .526 | 4.34 | 37 | 23 | 6 | 1 | 1 | 201.0 | 233 | 97 | 19 | 70 | 61 |
| Marcus Jarrett | 1901-1901 | 13 | 9 | .591 | 4.93 | 37 | 20 | 10 | 1 | 0 | 191.2 | 244 | 105 | 18 | 57 | 33 |
| Albert Jeffreys | 1914-1914 | 2 | 4 | .333 | 7.71 | 10 | 6 | 0 | 0 | 0 | 35.0 | 52 | 30 | 8 | 28 | 12 |
| Elías Jiménez | 1901-1905 | 90 | 69 | .566 | 3.51 | 182 | 160 | 123 | 10 | 8 | 1409.1 | 1476 | 549 | 89 | 290 | 555 |
| Ernesto Jiménez | 1910-1910 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 4.0 | 1 | 0 | 0 | 2 | 4 |
| Matías Jiménez | 1901-1909 | 104 | 159 | .395 | 4.57 | 307 | 283 | 160 | 9 | 0 | 2256.1 | 2514 | 1145 | 207 | 770 | 1158 |
| Gannon Johnson | 1914-1914 | 1 | 0 | 1.000 | 2.45 | 1 | 0 | 0 | 0 | 0 | 3.2 | 1 | 1 | 1 | 0 | 1 |
| Luca Jones | 1914-1914 | 0 | 5 | .000 | 7.02 | 6 | 6 | 0 | 0 | 0 | 33.1 | 45 | 26 | 3 | 18 | 7 |
| Stuart Jones | 1914-1914 | 0 | 0 | .000 | 1.17 | 3 | 0 | 0 | 0 | 0 | 7.2 | 5 | 1 | 0 | 2 | 6 |
| Efraín Jurado | 1905-1909 | 80 | 44 | .645 | 2.33 | 139 | 127 | 101 | 17 | 3 | 1138.0 | 892 | 295 | 53 | 263 | 737 |
