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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 |
|---|---|---|---|---|---|---|---|---|---|
| Cal Jackson | 2021-2022 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Frank Jackson | 2016-2016 | .000 | 0 | 0 | 1 | 0 | 1 | 1.46 | 12 |
| Jason Jackson | 2019-2022 | .000 | 0 | 0 | 13 | 39 | 0 | 6.82 | 197 |
| Leroy Jackson | 2016-2018 | .000 | 0 | 0 | 4 | 4 | 0 | 7.02 | 77 |
| Prince Michael Jackson | 2028-2034 | .000 | 0 | 0 | 9 | 12 | 0 | 4.62 | 93 |
| Russell Jackson | 2020-2030 | .226 | 16 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Abraham Jacobs | 2027-2027 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Jacobs | 2019-2025 | .000 | 0 | 0 | 14 | 19 | 12 | 5.74 | 199 |
| Brad Jacobson | 2022-2034 | .243 | 21 | 214 | 0 | 0 | 0 | 0.00 | 0 |
| Cody Jaeckel | 2035-2035 | .231 | 4 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| 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 |
| Joe James | 2036-2036 | .143 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard James | 2017-2021 | .273 | 51 | 156 | 0 | 0 | 0 | 0.00 | 0 |
| Wallace James | 2015-2016 | .336 | 8 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Wilbur James | 2022-2024 | .160 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Corbin Jameson | 2032-2032 | .000 | 0 | 0 | 1 | 0 | 3 | 1.29 | 14 |
| An Jang-Yop | 2026-2036 | .000 | 0 | 0 | 9 | 6 | 42 | 3.45 | 138 |
| Scott Janousek | 2025-2029 | .310 | 35 | 145 | 0 | 0 | 0 | 0.00 | 0 |
| Gerd Jans | 2015-2016 | .000 | 0 | 0 | 2 | 6 | 7 | 6.39 | 63 |
| Maxime Janssens | 2028-2030 | .000 | 0 | 0 | 15 | 6 | 0 | 2.67 | 114 |
| Augusto Jaramillo | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 2.70 | 10 |
| Nelson Jaramillo | 2029-2029 | .291 | 8 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Javier | 2015-2015 | .000 | 0 | 0 | 3 | 0 | 0 | 6.29 | 28 |
| Raúl Javier Jr. | 2023-2031 | .234 | 7 | 72 | 0 | 0 | 0 | 0.00 | 0 |
| Everette Jeffers | 2024-2027 | .229 | 5 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Jefferson | 2025-2028 | .261 | 6 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| William Jefferson | 2016-2017 | .278 | 6 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Jelarde | 2025-2033 | .243 | 30 | 118 | 0 | 0 | 0 | 0.00 | 0 |
| Rudy Jenkins | 2018-2018 | .000 | 0 | 0 | 1 | 16 | 0 | 7.09 | 101 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Marty Jennings | 2028-2029 | .218 | 11 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Jennings | 2033-2033 | .198 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Jensen | 2013-2016 | .000 | 0 | 0 | 1 | 0 | 0 | 7.50 | 24 |
| Mitch Jensen | 2016-2024 | .303 | 37 | 154 | 0 | 0 | 0 | 0.00 | 0 |
| Denis Jerningham | 2029-2029 | .271 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Ares Jilavian | 2018-2018 | .294 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Aurelio Jiménez | 2033-2034 | .282 | 3 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Jiménez | 2027-2027 | .000 | 0 | 0 | 0 | 1 | 7 | 3.60 | 17 |
| Francisco Jiménez | 2031-2033 | .000 | 0 | 0 | 7 | 7 | 0 | 7.86 | 112 |
| Gilberto Jiménez | 2031-2036 | .231 | 15 | 78 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Jiménez | 2031-2032 | .000 | 0 | 0 | 3 | 2 | 0 | 6.12 | 23 |
| Orlando Jiménez | 2020-2024 | .217 | 12 | 90 | 0 | 0 | 0 | 0.00 | 0 |
| Pedro Jiménez | 2020-2030 | .285 | 6 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Jimínez | 2033-2033 | .364 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Ray John | 2020-2030 | .287 | 42 | 169 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Johnson | 2016-2016 | .000 | 0 | 0 | 2 | 2 | 0 | 4.91 | 39 |
| Quinn Johnson | 2019-2027 | .231 | 8 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Johnson | 2024-2029 | .258 | 2 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Johnson | 2020-2024 | .287 | 4 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Anthony Johnston | 2019-2030 | .316 | 4 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Denver Johnston | 2017-2021 | .000 | 0 | 0 | 2 | 1 | 1 | 6.27 | 16 |
| Jacob Johnston | 2036-2036 | .000 | 0 | 0 | 7 | 4 | 1 | 4.37 | 47 |
| Pat Johnston | 2016-2018 | .333 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Johnston | 2028-2029 | .266 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Johnstone | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 7.94 | 5 |
| Nate Johnstone | 2034-2034 | .000 | 0 | 0 | 0 | 0 | 0 | 2.08 | 3 |
| Gary Jones | 2016-2023 | .000 | 0 | 0 | 16 | 12 | 13 | 5.20 | 127 |
| Henry Jones | 2023-2025 | .237 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Joey Jones | 2032-2032 | .300 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Kip Jones | 2016-2016 | .360 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Rod Jones | 2027-2027 | .238 | 4 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Jones | 2023-2030 | .224 | 29 | 184 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Jones | 2020-2029 | .000 | 0 | 0 | 13 | 20 | 8 | 4.97 | 203 |
| Gary Jordan | 2033-2033 | .000 | 0 | 0 | 0 | 0 | 0 | 7.88 | 7 |
| Greg Jordan | 2026-2028 | .000 | 0 | 0 | 1 | 6 | 2 | 5.70 | 42 |
| Gojong Joseon | 2033-2033 | .000 | 0 | 0 | 1 | 2 | 0 | 9.00 | 14 |
| Mimosa Joseph | 2022-2022 | .000 | 0 | 0 | 4 | 6 | 0 | 4.91 | 61 |
| Charles Josse | 2035-2035 | .282 | 4 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Jozwiak | 2028-2032 | .250 | 0 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| José Juárez | 2024-2025 | .000 | 0 | 0 | 0 | 1 | 0 | 3.86 | 6 |
| José Juárez | 2023-2030 | .000 | 0 | 0 | 9 | 10 | 3 | 5.40 | 137 |
| Miguel Juárez | 2019-2019 | .100 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Justice | 2024-2027 | .395 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Behar Jusufi | 2032-2032 | .000 | 0 | 0 | 3 | 2 | 0 | 5.36 | 37 |
