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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 |
|---|---|---|---|---|---|---|---|---|---|
| Jack Jacobs | 1956-1959 | .353 | 5 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Manny Jaimes | 1959-1959 | .231 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Yuri Janssen | 1956-1956 | .500 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Jaramillo | 1956-1959 | .000 | 0 | 0 | 1 | 1 | 0 | 6.75 | 4 |
| Jesus Jasso | 1959-1959 | .000 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Hervé Jean | 1959-1959 | .250 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Joaquim Jesus | 1959-1959 | .200 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Stevan Jigovic | 1959-1959 | .000 | 0 | 0 | 0 | 0 | 0 | 18.00 | 1 |
| Alex Jimenez | 1956-1956 | .000 | 0 | 0 | 0 | 0 | 0 | 12.00 | 2 |
| Alfredo Jimenez | 1956-1956 | .571 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Wu-ji Jiu | 1959-1959 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Norm Johnson | 1956-1959 | .000 | 0 | 0 | 0 | 1 | 0 | 6.00 | 1 |
| Andrusha Jolkevsky | 1956-1956 | .000 | 0 | 0 | 2 | 0 | 0 | 1.88 | 13 |
| Hughie Jones | 1956-1959 | .319 | 6 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Zier Jonkers | 1956-1956 | .000 | 0 | 0 | 0 | 0 | 0 | 6.14 | 2 |
| Ivan Jovic | 1959-1959 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Djodja Jugovic | 1956-1956 | .421 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Stevan Jugovic | 1956-1959 | .333 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
