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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 |
|---|---|---|---|---|---|---|---|---|---|
| Archie Jacobson | 2051-2051 | .000 | 0 | 0 | 1 | 1 | 0 | 5.65 | 20 |
| Eduardo Jaimes | 2049-2049 | .317 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Lars Jansen | 2050-2050 | .232 | 5 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Ivan Jeffes | 2049-2049 | .382 | 1 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| 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 |
| Carlos Jiménez | 2051-2051 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 4 |
| Christiansen Johannsen | 2049-2050 | .000 | 0 | 0 | 1 | 2 | 2 | 5.91 | 45 |
| Henry Jones | 2051-2051 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Chua chay Juan | 2050-2050 | .000 | 0 | 0 | 0 | 0 | 1 | 3.86 | 7 |
| Sixto Juárez | 2051-2051 | .172 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Visa Jänne | 2051-2051 | .000 | 0 | 0 | 3 | 5 | 0 | 3.91 | 87 |
