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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 |
|---|---|---|---|---|---|---|---|---|---|
| Kent Jackson | 2018-2018 | .323 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Russell Jackson | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Jamerson | 2015-2015 | .000 | 0 | 0 | 2 | 0 | 0 | 2.45 | 6 |
| Cal James | 2015-2015 | .243 | 5 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Wallace James | 2019-2019 | .105 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Gerd Jans | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Augusto Jaramillo | 2016-2019 | .143 | 0 | 0 | 12 | 10 | 43 | 2.74 | 140 |
| Juan Jaramillo | 2015-2019 | .265 | 32 | 168 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Jelarde | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Gil Jenkins | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Jensen | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mitch Jensen | 2019-2019 | .241 | 3 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Ares Jilavian | 2016-2017 | .223 | 8 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| António Jiménez | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Felipe Jiménez | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Jiménez | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Jiménez | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Franklin Johnson | 2015-2016 | .000 | 0 | 0 | 0 | 1 | 0 | 13.50 | 3 |
| Gregory Johnson | 2018-2019 | .246 | 3 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Johnson | 2015-2015 | .158 | 0 | 1 | 4 | 10 | 0 | 4.45 | 47 |
| Myron Johnson | 2016-2018 | .177 | 0 | 7 | 25 | 16 | 0 | 3.32 | 318 |
| William Johnson | 2016-2016 | .146 | 0 | 2 | 14 | 2 | 0 | 1.92 | 156 |
| Denver Johnston | 2017-2017 | .500 | 0 | 1 | 7 | 2 | 0 | 4.61 | 59 |
| Phil Johnston | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Walt Johnston | 2015-2016 | .182 | 0 | 5 | 22 | 14 | 0 | 3.39 | 194 |
| Sylvain Jolly | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Gary Jones | 2015-2019 | .267 | 0 | 1 | 8 | 14 | 3 | 5.17 | 90 |
| Harrison Jones | 2017-2019 | .206 | 1 | 14 | 33 | 14 | 0 | 2.62 | 340 |
| Joey Jones | 2018-2019 | .298 | 27 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Kip Jones | 2015-2015 | .210 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Leon Jones | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Jones | 2016-2019 | .220 | 0 | 14 | 22 | 15 | 1 | 3.72 | 262 |
| Ralph Jones | 2015-2017 | .200 | 0 | 1 | 7 | 5 | 1 | 2.48 | 75 |
| Tommy Jones | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Charles Jordan | 2018-2019 | .299 | 5 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Ricco Jovine | 0-0 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Joyce | 2015-2019 | .224 | 1 | 18 | 33 | 25 | 2 | 3.17 | 447 |
| Gabriel 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 |
