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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 |
|---|---|---|---|---|---|---|---|---|---|
| Jeremiah Jackson | 2018-2018 | .000 | 0 | 0 | 9 | 4 | 0 | 2.44 | 151 |
| Kevon Jackson | 2018-2018 | .289 | 2 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Luke Jackson | 2019-2023 | .000 | 0 | 0 | 13 | 6 | 1 | 4.85 | 219 |
| Josh James | 2020-2023 | .000 | 0 | 0 | 8 | 3 | 2 | 3.91 | 146 |
| Drey Jameson | 2023-2023 | .000 | 0 | 0 | 11 | 5 | 0 | 4.64 | 132 |
| Travis Jankowski | 2019-2023 | .240 | 11 | 123 | 0 | 0 | 0 | 0.00 | 0 |
| Danny Jansen | 2019-2023 | .241 | 48 | 158 | 0 | 0 | 0 | 0.00 | 0 |
| Kenley Jansen | 2019-2022 | .000 | 0 | 0 | 15 | 9 | 8 | 4.09 | 261 |
| Justin Jarvis | 2018-2018 | .388 | 3 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Cristian Javier | 2022-2023 | .000 | 0 | 0 | 16 | 14 | 5 | 4.87 | 245 |
| Wander Javier | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Griffin Jax | 2021-2023 | .000 | 0 | 0 | 8 | 10 | 1 | 5.37 | 94 |
| Jon Jay | 2019-2019 | .304 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Jay | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 3.12 | 11 |
| Daulton Jefferies | 2022-2023 | .000 | 0 | 0 | 10 | 23 | 0 | 6.36 | 188 |
| Ryan Jeffers | 2018-2023 | .238 | 12 | 58 | 7 | 2 | 0 | 2.05 | 85 |
| Jeremy Jeffress | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 4.50 | 3 |
| Greyson Jenista | 2018-2018 | .405 | 0 | 9 | 7 | 3 | 0 | 2.00 | 150 |
| Eric Jenkins | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Jennings | 2019-2019 | .000 | 0 | 0 | 5 | 5 | 1 | 4.39 | 66 |
| Ryan Jensen | 2022-2023 | .000 | 0 | 0 | 5 | 5 | 0 | 5.89 | 67 |
| Dany Jimenez | 2023-2023 | .000 | 0 | 0 | 2 | 3 | 2 | 2.33 | 62 |
| Eloy Jimenez | 2019-2023 | .262 | 135 | 416 | 0 | 0 | 0 | 0.00 | 0 |
| Joe Jimenez | 2019-2023 | .000 | 0 | 0 | 12 | 10 | 43 | 2.49 | 215 |
| Brian Johnson | 2019-2019 | .000 | 0 | 0 | 0 | 5 | 0 | 8.13 | 20 |
| Osiris Johnson | 2018-2018 | .375 | 1 | 10 | 4 | 0 | 0 | 0.52 | 89 |
| Pierce Johnson | 2021-2021 | .000 | 0 | 0 | 2 | 0 | 3 | 6.19 | 56 |
| Seth Johnson | 2023-2023 | .000 | 0 | 0 | 5 | 3 | 0 | 3.03 | 96 |
| Adam Jones | 2019-2019 | .180 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Connor Jones | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 9.00 | 8 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| JaCoby Jones | 2023-2023 | .186 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Jahmai Jones | 2020-2023 | .205 | 23 | 58 | 0 | 0 | 0 | 0.00 | 0 |
| Nolan Jones | 2021-2023 | .210 | 41 | 116 | 0 | 0 | 0 | 0.00 | 0 |
| Ryder Jones | 2021-2021 | .250 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Taylor Jones | 2023-2023 | .251 | 19 | 69 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron Judge | 2019-2023 | .261 | 156 | 392 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Jung | 2023-2023 | .274 | 3 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Jakob Junis | 2019-2023 | .000 | 0 | 0 | 7 | 9 | 0 | 5.81 | 120 |
| Janson Junk | 2023-2023 | .000 | 0 | 0 | 1 | 3 | 0 | 6.17 | 20 |
