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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 |
|---|---|---|---|---|---|---|---|---|---|
| Andre Jackson | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 1.08 | 15 |
| Kyle Jacobsen | 2020-2020 | .255 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Axel James | 2020-2020 | .200 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Kamren James | 2020-2020 | .243 | 0 | 13 | 0 | 0 | 0 | 0.00 | 4 |
| George Janca | 2020-2020 | .125 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Jenderson Jardines | 2020-2020 | .123 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Jarvis | 2020-2020 | .000 | 0 | 0 | 3 | 2 | 3 | 3.96 | 61 |
| Oliver Jaskie | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 0 | 3.48 | 10 |
| Wander Javier | 2020-2020 | .257 | 7 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Jaxel | 2020-2020 | .000 | 0 | 0 | 1 | 2 | 0 | 3.02 | 35 |
| Christian Jayne | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| William Jeffry | 2020-2020 | .255 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Andrew Jenkins | 2020-2020 | .206 | 3 | 5 | 1 | 0 | 0 | 3.00 | 9 |
| Tony Jenkins | 2020-2020 | .340 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Jennings | 2020-2020 | .000 | 0 | 0 | 1 | 2 | 0 | 4.85 | 33 |
| Cesar Jimenez | 2020-2020 | .159 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Gilberto Jimenez | 2020-2020 | .223 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Leonardo Jimenez | 2020-2020 | .220 | 5 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Melvin Jimenez | 2020-2020 | .000 | 0 | 0 | 0 | 2 | 0 | 6.92 | 14 |
| Leo Jiminian | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Alexander Johnson | 2020-2020 | .000 | 0 | 0 | 3 | 10 | 0 | 3.87 | 66 |
| Boby Johnson | 2020-2020 | .000 | 0 | 0 | 3 | 2 | 1 | 4.11 | 50 |
| Dominic Johnson | 2020-2020 | .227 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ivan Johnson | 2020-2020 | .273 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Johnson | 2020-2020 | .204 | 10 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Osiris Johnson | 2020-2020 | .216 | 6 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Brock Jones | 2020-2020 | .262 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Hayden Jones | 2020-2020 | .161 | 4 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Holt Jones | 2020-2020 | .000 | 0 | 0 | 0 | 3 | 1 | 4.59 | 36 |
| Jonathan Jones | 2020-2020 | .000 | 0 | 0 | 1 | 2 | 1 | 6.98 | 22 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Blaze Jordan | 2020-2020 | .205 | 4 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Landon Jordan | 2020-2020 | .200 | 7 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Luke Jordan | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 1 | 1.10 | 32 |
| Tavian Josenberger | 2020-2020 | .400 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Erick Julio | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 2.81 | 21 |
| Gage Jump | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 4.76 | 5 |
| Janson Junk | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 3 |
| Cameron Junker | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 1.80 | 7 |
