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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 | 1955-1955 | .294 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Garry Jakushkin | 1957-1957 | .143 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Jaramillo | 1955-1957 | .234 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jesus Jasso | 1957-1957 | .182 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Alejandro Javier | 1955-1955 | .500 | 0 | 0 | 1 | 1 | 0 | 4.35 | 2 |
| Hervé Jean | 1955-1957 | .214 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Joaquim Jesus | 1957-1957 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ke-yue Jian | 1957-1957 | .000 | 0 | 0 | 2 | 0 | 3 | 1.88 | 7 |
| Ivan Jimenez | 1955-1957 | .213 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Willie Jimenez | 1957-1957 | .500 | 0 | 0 | 0 | 0 | 0 | 2.57 | 3 |
| Wu-ji Jiu | 1957-1957 | .179 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Draza Jokanovic | 1957-1957 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Sean Jones | 1957-1957 | .000 | 0 | 0 | 1 | 0 | 0 | 2.08 | 1 |
| Logan Joseph | 1955-1955 | .333 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Vuk Jovovich | 1957-1957 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
