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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 | 2015-2018 | .323 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Prince Michael Jackson | 2029-2032 | .000 | 0 | 0 | 18 | 30 | 0 | 3.47 | 330 |
| Russell Jackson | 2019-2029 | .232 | 91 | 343 | 0 | 0 | 0 | 0.00 | 0 |
| Brad Jacobson | 2026-2026 | .205 | 1 | 3 | 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 |
| Wilbur James | 2022-2023 | .262 | 1 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Corbin Jameson | 2032-2032 | .000 | 0 | 0 | 1 | 1 | 0 | 8.10 | 5 |
| An Jang-Yop | 2029-2032 | .000 | 0 | 0 | 13 | 7 | 43 | 2.61 | 169 |
| Scott Janousek | 2026-2032 | .257 | 92 | 363 | 0 | 0 | 0 | 0.00 | 0 |
| Gerd Jans | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 2 |
| Maxime Janssens | 2029-2030 | .000 | 0 | 0 | 9 | 9 | 0 | 3.56 | 148 |
| 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 |
| Nelson Jaramillo | 2029-2032 | .267 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| José Jarca | 2032-2032 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Javier Jr. | 2022-2030 | .136 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Gil Jenkins | 2016-2017 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Jensen | 2019-2021 | .000 | 0 | 0 | 2 | 3 | 1 | 4.91 | 22 |
| Mitch Jensen | 2019-2025 | .220 | 8 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Denis Jerningham | 2029-2029 | .224 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Ares Jilavian | 2015-2017 | .223 | 8 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Félix Jiménez | 2022-2026 | .000 | 0 | 0 | 38 | 31 | 0 | 4.41 | 735 |
| Gilberto Jiménez | 2030-2031 | .231 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Orlando Jiménez | 2022-2023 | .203 | 5 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Ji Jing | 2030-2032 | .000 | 0 | 0 | 5 | 7 | 0 | 4.68 | 35 |
| Ray John | 2025-2025 | .211 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Franklin Johnson | 2015-2016 | .000 | 0 | 0 | 0 | 1 | 0 | 13.50 | 3 |
| Gregory Johnson | 2018-2023 | .255 | 6 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Joe Johnson | 2015-2021 | .158 | 0 | 1 | 7 | 13 | 0 | 4.64 | 67 |
| Myron Johnson | 2015-2018 | .177 | 0 | 7 | 25 | 16 | 0 | 3.32 | 318 |
| William Johnson | 2016-2016 | .146 | 0 | 2 | 14 | 2 | 0 | 1.92 | 156 |
| Anthony Johnston | 2021-2030 | .229 | 0 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Denver Johnston | 2017-2020 | .400 | 0 | 2 | 9 | 2 | 0 | 3.59 | 90 |
| Phil Johnston | 2017-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Walt Johnston | 2015-2021 | .182 | 0 | 5 | 22 | 14 | 0 | 3.39 | 194 |
| Sylvain Jolly | 2019-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Barry Jones | 2024-2027 | .000 | 0 | 0 | 8 | 6 | 4 | 3.68 | 132 |
| Gary Jones | 2015-2020 | .267 | 0 | 1 | 8 | 15 | 4 | 5.45 | 90 |
| Harrison Jones | 2017-2021 | .206 | 1 | 14 | 33 | 14 | 0 | 2.62 | 340 |
| Henry Jones | 2023-2025 | .207 | 3 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Joey Jones | 2018-2032 | .301 | 27 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| Kip Jones | 2015-2015 | .210 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Jones | 2016-2020 | .208 | 0 | 22 | 30 | 28 | 1 | 4.48 | 309 |
| Ralph Jones | 2015-2017 | .200 | 0 | 1 | 7 | 5 | 1 | 2.48 | 75 |
| Robert Jones | 2020-2020 | .200 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Rod Jones | 2023-2027 | .223 | 6 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Jones | 2029-2029 | .222 | 10 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Tommy Jones | 2017-2031 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Charles Jordan | 2018-2028 | .278 | 5 | 77 | 0 | 0 | 0 | 0.00 | 0 |
| Greg Jordan | 2020-2026 | .000 | 0 | 0 | 14 | 4 | 24 | 2.78 | 98 |
| Richard Jost | 2029-2032 | .274 | 48 | 155 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Joyce | 2015-2019 | .224 | 1 | 18 | 33 | 25 | 2 | 3.17 | 447 |
| Arlen Joysey | 2025-2032 | .232 | 20 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Gilberto Juárez | 2028-2032 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Júlio | 2015-2026 | .000 | 0 | 0 | 0 | 4 | 1 | 4.11 | 52 |
| Tony Justice | 2024-2027 | .231 | 12 | 62 | 0 | 0 | 0 | 0.00 | 0 |
