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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 |
|---|---|---|---|---|---|---|---|---|---|
| Jason Jackson | 2017-2018 | .000 | 0 | 0 | 11 | 9 | 0 | 6.22 | 164 |
| Kent Jackson | 2017-2019 | .313 | 21 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Ricky Jackson | 2025-2028 | .000 | 0 | 0 | 25 | 25 | 0 | 4.90 | 239 |
| Russell Jackson | 2017-2018 | .282 | 24 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Abraham Jacobs | 2025-2026 | .235 | 8 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Jacobs | 2023-2024 | .000 | 0 | 0 | 10 | 11 | 4 | 4.45 | 111 |
| Leonard James | 2022-2023 | .259 | 17 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Wilbur James | 2020-2021 | .251 | 3 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| An Jang-Yop | 2027-2027 | .000 | 0 | 0 | 2 | 3 | 13 | 4.05 | 34 |
| Gerd Jans | 2017-2021 | .000 | 0 | 0 | 11 | 9 | 4 | 6.86 | 142 |
| Maxime Janssens | 2026-2026 | .000 | 0 | 0 | 3 | 1 | 0 | 4.08 | 19 |
| José Jarca | 2027-2028 | .288 | 16 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Javier Jr. | 2026-2028 | .292 | 2 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Gil Jenkins | 2015-2016 | .330 | 17 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| John Jenkins | 2020-2020 | .270 | 8 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Jenkins | 2017-2017 | .292 | 0 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Marty Jennings | 2025-2027 | .286 | 11 | 76 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Jensen | 2017-2017 | .000 | 0 | 0 | 0 | 1 | 1 | 6.75 | 12 |
| Edward Jensen | 2015-2021 | .000 | 0 | 0 | 2 | 9 | 1 | 11.34 | 29 |
| Mitch Jensen | 2022-2023 | .264 | 8 | 44 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Jiménez | 2028-2028 | .000 | 0 | 0 | 6 | 1 | 21 | 3.07 | 55 |
| Félix Jiménez | 2028-2028 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 3 |
| Mario Jiménez | 2021-2021 | .000 | 0 | 0 | 0 | 1 | 0 | 21.60 | 1 |
| Pedro Jiménez | 2024-2026 | .233 | 1 | 45 | 0 | 0 | 0 | 0.00 | 0 |
| Ji Jing | 2027-2027 | .000 | 0 | 0 | 3 | 3 | 0 | 3.33 | 38 |
| Ray John | 2023-2028 | .286 | 44 | 183 | 0 | 0 | 0 | 0.00 | 0 |
| Cole Johnson | 2021-2021 | .000 | 0 | 0 | 4 | 5 | 0 | 4.55 | 69 |
| Gregory Johnson | 2019-2025 | .248 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Johnson | 2017-2020 | .000 | 0 | 0 | 4 | 6 | 0 | 6.63 | 50 |
| Myron Johnson | 2020-2020 | .000 | 0 | 0 | 2 | 8 | 0 | 7.68 | 32 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Paul Johnson | 2018-2018 | .268 | 2 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Johnson | 2018-2018 | .357 | 8 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Johnson | 2026-2028 | .272 | 0 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Anthony Johnston | 2019-2028 | .308 | 1 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Denver Johnston | 2015-2023 | .000 | 0 | 0 | 10 | 9 | 1 | 6.51 | 142 |
| Phil Johnston | 2022-2024 | .161 | 3 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Johnston | 2025-2027 | .214 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Dustin Johnstone | 2021-2021 | .267 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Johnstone | 2017-2019 | .000 | 0 | 0 | 10 | 23 | 1 | 7.14 | 152 |
| Steven Johnstone | 2015-2019 | .321 | 4 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Ethan Jollymour | 2020-2020 | 1.000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Bryan Jones | 2024-2026 | .000 | 0 | 0 | 2 | 2 | 1 | 6.75 | 22 |
| Gary Jones | 2019-2025 | .000 | 0 | 0 | 9 | 7 | 11 | 3.94 | 91 |
| Harrison Jones | 2026-2026 | .280 | 0 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Harrison Jones | 2020-2020 | .000 | 0 | 0 | 5 | 0 | 0 | 2.37 | 48 |
| Henry Jones | 2018-2020 | .234 | 4 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard Jones | 2015-2018 | .278 | 16 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Jones | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 4.50 | 10 |
| Steve Jones | 2022-2022 | .153 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Jones | 2023-2023 | .000 | 0 | 0 | 1 | 3 | 0 | 7.83 | 14 |
| Charles Jordan | 2020-2025 | .244 | 1 | 87 | 0 | 0 | 0 | 0.00 | 0 |
| Greg Jordan | 2027-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 1.93 | 6 |
| Mimosa Joseph | 2023-2023 | .000 | 0 | 0 | 0 | 1 | 0 | 2.08 | 5 |
| Arlen Joysey | 2027-2027 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Gilberto Juárez | 2027-2027 | .218 | 7 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| José Juárez | 2024-2025 | .000 | 0 | 0 | 8 | 12 | 0 | 5.00 | 114 |
| Miguel Juárez | 2020-2020 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Justice | 2023-2023 | .305 | 5 | 44 | 0 | 0 | 0 | 0.00 | 0 |
