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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 |
|---|---|---|---|---|---|---|---|---|---|
| Alex Jackson | 2017-2025 | .246 | 154 | 510 | 0 | 0 | 0 | 0.00 | 0 |
| Austin Jackson | 2015-2015 | .246 | 8 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Bo Jackson | 2020-2025 | .228 | 36 | 139 | 0 | 0 | 0 | 0.00 | 0 |
| Edwin Jackson | 2016-2016 | .000 | 0 | 0 | 11 | 11 | 0 | 4.05 | 110 |
| Ryan Jackson | 2017-2019 | .222 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Shoeless Joe Jackson | 2018-2025 | .307 | 77 | 491 | 0 | 0 | 0 | 0.00 | 0 |
| Kyle Jacobsen | 2022-2025 | .247 | 59 | 252 | 0 | 0 | 0 | 54.00 | 0 |
| Eric Jagielo | 2019-2022 | .200 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Kenley Jansen | 2015-2023 | .000 | 0 | 0 | 30 | 45 | 270 | 2.74 | 814 |
| Casey Janssen | 2015-2018 | .000 | 0 | 0 | 9 | 9 | 6 | 4.55 | 195 |
| Ryan January | 2019-2019 | .154 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| John Jaso | 2015-2015 | .167 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Wander Javier | 2022-2022 | .273 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Jon Jay | 2015-2017 | .293 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Jeremy Jeffress | 2015-2020 | .000 | 0 | 0 | 1 | 1 | 2 | 2.01 | 13 |
| Eric Jenkins | 2020-2025 | .246 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Tyrell Jenkins | 2017-2018 | .000 | 0 | 0 | 1 | 3 | 0 | 4.35 | 49 |
| Chris Jennings | 2024-2025 | .063 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Dan Jennings | 2015-2017 | .000 | 0 | 0 | 3 | 1 | 0 | 2.83 | 35 |
| Desmond Jennings | 2015-2016 | .224 | 10 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Jin-De Jhang | 2021-2021 | .368 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| A.J. Jimenez | 2017-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Víctor Jiménez | 2024-2025 | .255 | 33 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Johnson | 2018-2025 | .000 | 0 | 0 | 12 | 14 | 0 | 4.06 | 133 |
| Claude Johnson | 2024-2024 | .000 | 0 | 0 | 2 | 2 | 0 | 6.69 | 28 |
| Cobi Johnson | 2021-2024 | .000 | 0 | 0 | 9 | 14 | 0 | 4.12 | 173 |
| Cooper Johnson | 2022-2025 | .280 | 18 | 73 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Johnson | 2015-2017 | .000 | 0 | 0 | 14 | 9 | 2 | 3.57 | 175 |
| Josh Johnson | 2016-2021 | .000 | 0 | 0 | 30 | 30 | 5 | 4.35 | 471 |
| Micah Johnson | 2017-2022 | .258 | 40 | 208 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Pierce Johnson | 2022-2025 | .000 | 0 | 0 | 19 | 30 | 0 | 4.85 | 360 |
| Ryan Johnson | 2022-2025 | .242 | 24 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Jones | 2015-2016 | .263 | 20 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Terence Jones | 2024-2025 | .229 | 32 | 95 | 0 | 0 | 0 | 0.00 | 0 |
| Ben Jordan | 2021-2025 | .000 | 0 | 0 | 43 | 35 | 0 | 4.04 | 677 |
| Nelson Jorge | 2022-2022 | .176 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Caleb Joseph | 2015-2016 | .217 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Jarid Joseph | 2018-2025 | .278 | 162 | 611 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Joyce | 2015-2015 | .193 | 3 | 6 | 0 | 0 | 0 | 0.00 | 0 |
