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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 | 1 | 1 | 5.23 | 13 |
| Kent Jackson | 2015-2016 | .242 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Augusto Jaramillo | 2014-2015 | .250 | 0 | 0 | 4 | 10 | 53 | 2.98 | 85 |
| Juan Jaramillo | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Javier | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Rudy Jedburgh | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Gil Jenkins | 2015-2015 | .273 | 2 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Jensen | 2019-2019 | .125 | 0 | 0 | 2 | 2 | 0 | 6.13 | 34 |
| Mitch Jensen | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ares Jilavian | 2014-2014 | .316 | 16 | 68 | 0 | 0 | 0 | 0.00 | 0 |
| Félix Jiménez | 2018-2019 | .194 | 0 | 5 | 14 | 12 | 0 | 3.64 | 282 |
| Mario Jiménez | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Gregory Johnson | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Johnson | 2019-2019 | .000 | 0 | 0 | 6 | 1 | 1 | 6.04 | 35 |
| Myron Johnson | 2014-2019 | .226 | 0 | 12 | 24 | 18 | 0 | 4.47 | 325 |
| William Johnson | 2017-2017 | .333 | 0 | 0 | 3 | 1 | 0 | 3.76 | 35 |
| Denver Johnston | 2015-2018 | .176 | 0 | 0 | 11 | 9 | 6 | 6.02 | 125 |
| Phil Johnston | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Walt Johnston | 2014-2019 | .196 | 0 | 7 | 27 | 24 | 8 | 4.27 | 239 |
| Steven Johnstone | 2016-2016 | .190 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Sylvain Jolly | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Joey Jones | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kip Jones | 2014-2014 | .220 | 5 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Jones | 2014-2015 | .260 | 0 | 7 | 3 | 11 | 0 | 6.13 | 74 |
| Ralph Jones | 2016-2016 | .235 | 0 | 3 | 3 | 4 | 0 | 5.00 | 44 |
| Rod Jones | 2019-2019 | .154 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tommy Jones | 2015-2017 | .315 | 39 | 175 | 0 | 0 | 0 | 0.00 | 0 |
| Charles Jordan | 2018-2018 | .245 | 1 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Greg Jordan | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Joyce | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Orlando Juárez | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Júlio | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
