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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dean Jackson | 2036-2036 | .319 | 19 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Jackson | 2016-2016 | .000 | 0 | 0 | 7 | 7 | 0 | 4.98 | 96 |
| Kevin Jackson | 2017-2018 | .322 | 16 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Jackson | 2035-2035 | .000 | 0 | 0 | 2 | 12 | 0 | 5.44 | 82 |
| Ricky Jackson | 2024-2024 | .000 | 0 | 0 | 11 | 7 | 0 | 4.03 | 99 |
| Brad Jacobson | 2033-2033 | .316 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Cody Jaeckel | 2033-2034 | .239 | 5 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Joe James | 2035-2035 | .667 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard James | 2024-2025 | .264 | 15 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Corbin Jameson | 2026-2027 | .000 | 0 | 0 | 2 | 0 | 8 | 3.00 | 21 |
| Gerd Jans | 2016-2023 | .000 | 0 | 0 | 2 | 3 | 0 | 5.75 | 53 |
| Cornelio Japón | 2035-2035 | .264 | 9 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Branlyn Jaraba | 2035-2036 | .000 | 0 | 0 | 3 | 4 | 4 | 3.90 | 21 |
| José Jarca | 2030-2034 | .304 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Kostenka Jarovtsev | 2035-2035 | .000 | 0 | 0 | 0 | 0 | 0 | 2.08 | 2 |
| Rudy Jedburgh | 2016-2017 | .261 | 9 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Jefferson | 2017-2022 | .348 | 46 | 179 | 0 | 0 | 0 | 0.00 | 0 |
| Gil Jenkins | 2019-2020 | .271 | 15 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| John Jenkins | 2015-2022 | .279 | 19 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Jenkins | 2020-2023 | .282 | 4 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Edward Jensen | 2019-2019 | .000 | 0 | 0 | 1 | 1 | 0 | 12.64 | 24 |
| Ares Jilavian | 2015-2015 | .368 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Aurelio Jiménez | 2036-2036 | .235 | 3 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Jiménez | 2029-2036 | .000 | 0 | 0 | 7 | 8 | 39 | 3.35 | 143 |
| Felipe Jiménez | 2027-2029 | .157 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Félix Jiménez | 2016-2018 | .000 | 0 | 0 | 13 | 15 | 0 | 5.80 | 285 |
| Luis Jiménez | 2021-2025 | .303 | 7 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Mario Jiménez | 2016-2020 | .000 | 0 | 0 | 9 | 3 | 2 | 5.18 | 82 |
| Ji Jing | 2026-2031 | .000 | 0 | 0 | 7 | 9 | 0 | 4.23 | 102 |
| Ray John | 2027-2027 | .327 | 4 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Terry John | 2034-2036 | .312 | 9 | 115 | 0 | 0 | 0 | 0.00 | 0 |
| Cole Johnson | 2016-2020 | .000 | 0 | 0 | 22 | 27 | 0 | 4.83 | 375 |
| Gregory Johnson | 2026-2026 | .667 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| John Johnson | 2016-2016 | .333 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Keith Johnson | 2033-2034 | .000 | 0 | 0 | 2 | 3 | 15 | 5.59 | 24 |
| Paul Johnson | 2019-2019 | .219 | 3 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Anthony Johnston | 2018-2031 | .328 | 4 | 97 | 0 | 0 | 0 | 0.00 | 0 |
| Curt Johnston | 2023-2025 | .244 | 2 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Denver Johnston | 2024-2024 | .000 | 0 | 0 | 3 | 1 | 0 | 3.51 | 26 |
| Walt Johnston | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 2.16 | 7 |
| Dustin Johnstone | 2018-2020 | .298 | 13 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Johnstone | 2020-2020 | .247 | 3 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Ethan Jollymour | 2015-2019 | .300 | 23 | 109 | 0 | 0 | 0 | 0.00 | 0 |
| Barry Jones | 2015-2029 | .000 | 0 | 0 | 19 | 12 | 46 | 3.85 | 254 |
| Bryan Jones | 2021-2029 | .000 | 0 | 0 | 0 | 1 | 0 | 4.42 | 16 |
| Gary Jones | 2026-2027 | .000 | 0 | 0 | 8 | 2 | 0 | 5.00 | 70 |
| Henry Jones | 2021-2022 | .291 | 0 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Joey Jones | 2024-2026 | .337 | 7 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| John Jones | 2015-2016 | .000 | 0 | 0 | 7 | 6 | 5 | 4.20 | 114 |
| Obi Jones | 2034-2034 | .222 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Rod Jones | 2021-2021 | .250 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Timothy Jones | 2026-2027 | .167 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Jones | 2019-2022 | .000 | 0 | 0 | 14 | 9 | 0 | 4.29 | 170 |
| Tommy Jones | 2024-2036 | .338 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Jing-sheng Joo | 2030-2036 | .268 | 20 | 147 | 0 | 0 | 0 | 0.00 | 0 |
| Greg Jordan | 2019-2025 | .000 | 0 | 0 | 0 | 2 | 1 | 10.50 | 16 |
| Gojong Joseon | 2031-2031 | .000 | 0 | 0 | 0 | 1 | 0 | 3.86 | 4 |
| Mimosa Joseph | 2025-2036 | .000 | 0 | 0 | 10 | 8 | 1 | 2.84 | 102 |
| Johnny Joyce | 2021-2022 | .000 | 0 | 0 | 6 | 8 | 4 | 6.46 | 15 |
| Arlen Joysey | 2024-2025 | .262 | 17 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| José Juárez | 2026-2026 | .000 | 0 | 0 | 3 | 0 | 0 | 4.57 | 15 |
| José Juárez | 2028-2028 | .000 | 0 | 0 | 0 | 1 | 0 | 18.00 | 0 |
| Miguel Juárez | 2021-2022 | .311 | 15 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| T.J. Juckson | 2036-2036 | .000 | 0 | 0 | 4 | 2 | 19 | 3.68 | 29 |
| Juan Júlio | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 1 | 0.00 | 1 |
| Jim Justice | 2030-2033 | .298 | 1 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Justice | 2028-2030 | .255 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
