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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 |
|---|---|---|---|---|---|---|---|---|---|
| Frank Jackson | 2016-2016 | .000 | 0 | 0 | 1 | 0 | 1 | 1.46 | 12 |
| Jason Jackson | 2019-2020 | .000 | 0 | 0 | 5 | 16 | 0 | 6.08 | 90 |
| Leroy Jackson | 2016-2018 | .000 | 0 | 0 | 4 | 4 | 0 | 7.02 | 77 |
| Russell Jackson | 2020-2020 | .360 | 3 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Jacobs | 2019-2020 | .000 | 0 | 0 | 4 | 13 | 8 | 7.65 | 85 |
| Justin Jamerson | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 5.00 | 11 |
| Cal James | 2016-2017 | .284 | 7 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard James | 2017-2020 | .286 | 40 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Wallace James | 2015-2016 | .336 | 8 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Gerd Jans | 2015-2016 | .000 | 0 | 0 | 2 | 6 | 7 | 6.39 | 63 |
| Augusto Jaramillo | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 2.70 | 10 |
| Raúl Javier | 2015-2015 | .000 | 0 | 0 | 3 | 0 | 0 | 6.29 | 28 |
| William Jefferson | 2016-2017 | .278 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Rudy Jenkins | 2018-2018 | .000 | 0 | 0 | 1 | 16 | 0 | 7.09 | 101 |
| Bill Jensen | 2013-2016 | .000 | 0 | 0 | 1 | 0 | 0 | 7.50 | 24 |
| Mitch Jensen | 2016-2019 | .304 | 37 | 154 | 0 | 0 | 0 | 0.00 | 0 |
| Ares Jilavian | 2018-2018 | .294 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Orlando Jiménez | 2020-2020 | .235 | 4 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Jiménez | 2020-2020 | .265 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Ray John | 2020-2020 | .297 | 12 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Johnson | 2016-2016 | .000 | 0 | 0 | 2 | 2 | 0 | 4.91 | 39 |
| Quinn Johnson | 2019-2019 | .232 | 3 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Johnson | 2020-2020 | .188 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Anthony Johnston | 2019-2019 | .316 | 4 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Denver Johnston | 2017-2017 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 1 |
| Pat Johnston | 2016-2018 | .333 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Johnstone | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 7.94 | 5 |
| Gary Jones | 2016-2020 | .000 | 0 | 0 | 13 | 8 | 11 | 5.88 | 102 |
| Kip Jones | 2016-2016 | .360 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Jones | 2020-2020 | .000 | 0 | 0 | 1 | 5 | 3 | 7.34 | 27 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Miguel Juárez | 2019-2019 | .100 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
