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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 |
|---|---|---|---|---|---|---|---|---|---|
| Justin Jackson | 2017-2017 | .000 | 0 | 0 | 2 | 1 | 1 | 5.75 | 56 |
| Brandon Jacobs | 2014-2014 | .306 | 4 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Tanner Jacobson | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 6.75 | 6 |
| Daniel James | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 6.50 | 18 |
| Jiwan James | 2014-2016 | .284 | 15 | 113 | 0 | 0 | 0 | 0.00 | 0 |
| Keegan James | 2023-2023 | .000 | 0 | 0 | 2 | 8 | 0 | 5.60 | 79 |
| Sean Jamieson | 2013-2016 | .286 | 47 | 266 | 0 | 0 | 0 | 0.00 | 0 |
| Jordan Jankowski | 2013-2014 | .000 | 0 | 0 | 4 | 12 | 0 | 5.82 | 120 |
| Danny Jansen | 2019-2019 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Jarvis | 2017-2017 | .261 | 4 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| Cristian Javier | 2019-2019 | .000 | 0 | 0 | 3 | 1 | 0 | 2.38 | 34 |
| Wander Javier | 2019-2022 | .250 | 27 | 157 | 0 | 0 | 0 | 0.00 | 0 |
| Myles Jaye | 2016-2016 | .000 | 0 | 0 | 0 | 1 | 0 | 3.31 | 15 |
| Luis Jean | 2020-2021 | .340 | 11 | 55 | 0 | 0 | 0 | 0.00 | 0 |
| Ronnie Jebavy | 2018-2019 | .251 | 9 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Jake Jefferies | 2017-2018 | .283 | 8 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Zach Jemiola | 2015-2018 | .000 | 0 | 0 | 9 | 7 | 1 | 4.56 | 131 |
| Derek Jenkins | 2019-2019 | .241 | 1 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Erik Jenkins | 2016-2021 | .253 | 21 | 135 | 0 | 0 | 0 | 0.00 | 0 |
| Ryan Jennings | 2022-2022 | .000 | 0 | 0 | 1 | 0 | 0 | 2.25 | 8 |
| Steven Jennings | 2020-2020 | .000 | 0 | 0 | 1 | 0 | 1 | 3.28 | 25 |
| Jordan Jess | 2018-2019 | .000 | 0 | 0 | 9 | 5 | 2 | 6.53 | 103 |
| Tommy Jew | 2020-2023 | .256 | 19 | 102 | 0 | 0 | 0 | 0.00 | 0 |
| Emerson Jimenez | 2021-2021 | .333 | 0 | 0 | 1 | 1 | 0 | 1.71 | 24 |
| Melvin Jimenez | 2019-2019 | .000 | 0 | 0 | 2 | 3 | 0 | 6.34 | 23 |
| Nick Jobst | 2018-2018 | .000 | 0 | 0 | 1 | 0 | 1 | 6.03 | 38 |
| Jake Johansen | 2015-2018 | .000 | 0 | 0 | 3 | 3 | 2 | 5.33 | 175 |
| Bryce Johnson | 2019-2021 | .303 | 12 | 108 | 0 | 0 | 0 | 0.00 | 0 |
| Cole Johnson | 2013-2015 | .000 | 0 | 0 | 6 | 5 | 9 | 4.76 | 60 |
| Cooper Johnson | 2022-2023 | .240 | 8 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Dom Johnson | 2022-2022 | .273 | 2 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Hobbs Johnson | 2015-2017 | .000 | 0 | 0 | 1 | 9 | 4 | 8.59 | 81 |
| Jordan Johnson | 2017-2020 | .000 | 0 | 0 | 15 | 22 | 2 | 4.89 | 381 |
| Kaleo Johnson | 2019-2020 | .252 | 12 | 39 | 0 | 0 | 0 | 36.00 | 0 |
| Kevin Johnson | 2015-2015 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 3 |
| Marcus Johnson | 2022-2022 | .000 | 0 | 0 | 1 | 2 | 0 | 5.25 | 24 |
| Osiris Johnson | 2023-2023 | .276 | 6 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Termarr Johnson | 2023-2023 | .319 | 8 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Johnson | 2022-2023 | .000 | 0 | 0 | 4 | 3 | 0 | 5.01 | 52 |
| Eric Jokisch | 2013-2014 | .000 | 0 | 0 | 9 | 12 | 0 | 4.31 | 163 |
| Chris Jones | 2013-2013 | .000 | 0 | 0 | 0 | 0 | 0 | 1.10 | 20 |
| Derek Jones | 2014-2016 | .262 | 25 | 149 | 0 | 0 | 0 | 0.00 | 0 |
| Hunter Jones | 2018-2018 | .500 | 2 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jared Jones | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kyle Jones | 2022-2022 | .000 | 0 | 0 | 1 | 0 | 0 | 0.00 | 5 |
| Matt Jones | 2016-2018 | .257 | 15 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Matt A. Jones | 2018-2018 | .000 | 0 | 0 | 0 | 0 | 0 | 27.00 | 1 |
| Nate Jones | 2022-2023 | .000 | 0 | 0 | 5 | 2 | 0 | 3.35 | 44 |
| Spencer Jones | 2022-2022 | .325 | 3 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Tyler Jones | 2014-2016 | .000 | 0 | 0 | 2 | 9 | 9 | 5.49 | 82 |
| Jose Jose | 2016-2016 | .000 | 0 | 0 | 0 | 2 | 12 | 3.51 | 23 |
| Ben Joyce | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 1 | 0.00 | 4 |
| Corey Joyce | 2020-2020 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Terrell Joyce | 2013-2018 | .247 | 24 | 126 | 0 | 0 | 0 | 0.00 | 0 |
| Victor Juarez | 2023-2023 | .000 | 0 | 0 | 7 | 5 | 0 | 3.54 | 88 |
| Hayden Juenger | 2022-2023 | .000 | 0 | 0 | 4 | 10 | 7 | 4.77 | 106 |
| Edouard Julien | 2020-2020 | .333 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Cameron Junker | 2023-2023 | .000 | 0 | 0 | 3 | 1 | 0 | 4.17 | 72 |
| Connor Justus | 2019-2019 | .172 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
