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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 |
|---|---|---|---|---|---|---|---|---|---|
| David Jackson | 2056-2056 | .261 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Archie Jacobson | 2051-2052 | .000 | 0 | 0 | 1 | 1 | 1 | 3.12 | 37 |
| Eduardo Jaimes | 2049-2049 | .317 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Henry Jans | 2055-2055 | .238 | 8 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Lars Jansen | 2050-2050 | .232 | 5 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Yll Januzaj | 2052-2052 | .300 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry Jaramillo | 2053-2053 | .236 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| José Javellana | 2053-2055 | .257 | 11 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Ivan Jeffes | 2049-2049 | .382 | 1 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Eric Jenkins | 2053-2053 | .000 | 0 | 0 | 4 | 4 | 0 | 2.34 | 78 |
| Ken Jennings | 2051-2051 | .174 | 3 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Mick Jermy | 2049-2049 | .356 | 0 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Nick Jewell | 2056-2056 | .240 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Min Ji | 2053-2054 | .333 | 0 | 0 | 3 | 1 | 5 | 3.11 | 50 |
| Wang-fen Jia | 2053-2054 | .000 | 0 | 0 | 9 | 7 | 0 | 2.69 | 122 |
| Wu-shiun Jia | 2055-2056 | .000 | 0 | 0 | 2 | 1 | 1 | 2.37 | 37 |
| Carlos Jiménez | 2051-2052 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 6 |
| César Jiménez | 2056-2056 | .158 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Pablo Jiménez | 2053-2053 | .000 | 0 | 0 | 5 | 4 | 0 | 2.81 | 100 |
| Pedro Jiménez | 2055-2055 | .223 | 8 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Ahn Jin-ah | 2052-2054 | .227 | 17 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Christiansen Johannsen | 2049-2050 | .000 | 0 | 0 | 1 | 2 | 2 | 5.91 | 45 |
| Mike Jolly | 2056-2056 | .000 | 0 | 0 | 1 | 1 | 3 | 4.60 | 17 |
| Henry Jones | 2051-2051 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Eiichi Jouda | 2054-2054 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 3 |
| Chua chay Juan | 2050-2050 | .000 | 0 | 0 | 0 | 0 | 1 | 3.86 | 7 |
| Eng-hee Juan | 2054-2054 | .000 | 0 | 0 | 2 | 2 | 1 | 3.21 | 64 |
| Pierre-Jean Jung | 2052-2052 | .000 | 0 | 0 | 5 | 2 | 6 | 1.58 | 47 |
| Esko Juusten | 2053-2053 | .167 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Sixto Juárez | 2051-2051 | .172 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Visa Jänne | 2051-2052 | .000 | 0 | 0 | 3 | 6 | 1 | 3.61 | 98 |
