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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 |
| Russell Jackson | 2017-2018 | .282 | 24 | 85 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Jacobs | 2023-2023 | .000 | 0 | 0 | 4 | 7 | 1 | 4.33 | 62 |
| 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 |
| Gerd Jans | 2017-2021 | .000 | 0 | 0 | 11 | 9 | 4 | 6.86 | 142 |
| 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 |
| 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 |
| Mario Jiménez | 2021-2021 | .000 | 0 | 0 | 0 | 1 | 0 | 21.60 | 1 |
| Ray John | 2023-2023 | .289 | 8 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Cole Johnson | 2021-2021 | .000 | 0 | 0 | 4 | 5 | 0 | 4.55 | 69 |
| Gregory Johnson | 2019-2019 | .364 | 0 | 2 | 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 |
| 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 |
| Anthony Johnston | 2019-2019 | .306 | 1 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Denver Johnston | 2015-2023 | .000 | 0 | 0 | 10 | 9 | 1 | 6.51 | 142 |
| Phil Johnston | 2022-2023 | .145 | 2 | 7 | 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 |
| Gary Jones | 2019-2022 | .000 | 0 | 0 | 6 | 6 | 10 | 3.73 | 65 |
| Harrison Jones | 2020-2020 | .000 | 0 | 0 | 5 | 0 | 0 | 2.37 | 48 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| 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 | 2020-2023 | .232 | 0 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Mimosa Joseph | 2023-2023 | .000 | 0 | 0 | 0 | 1 | 0 | 2.08 | 5 |
| 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 |
