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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jeremiah Jackson | 2020-2023 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.1 | 0 | 0 | 0 | 2 | 0 |
| Kris Jackson | 2021-2021 | 1 | 4 | .200 | 9.68 | 23 | 8 | 0 | 0 | 1 | 53.0 | 67 | 57 | 10 | 43 | 31 |
| Luke Jackson | 2015-2015 | 4 | 3 | .571 | 3.17 | 12 | 12 | 0 | 0 | 0 | 65.1 | 53 | 23 | 6 | 31 | 86 |
| Alek Jacob | 2023-2023 | 2 | 1 | .667 | 1.32 | 19 | 0 | 0 | 0 | 3 | 27.1 | 25 | 4 | 1 | 17 | 28 |
| David Jagoditsh | 2014-2015 | 2 | 0 | 1.000 | 12.33 | 62 | 0 | 0 | 0 | 1 | 76.2 | 130 | 105 | 20 | 86 | 54 |
| Thomas Jankins | 2019-2022 | 10 | 12 | .455 | 5.80 | 49 | 37 | 1 | 0 | 0 | 173.2 | 218 | 112 | 25 | 73 | 100 |
| Oliver Jaskie | 2019-2019 | 1 | 0 | 1.000 | 5.82 | 3 | 3 | 0 | 0 | 0 | 17.0 | 22 | 11 | 0 | 6 | 5 |
| Odalvi Javier | 2022-2023 | 6 | 11 | .353 | 6.24 | 41 | 20 | 0 | 0 | 1 | 148.2 | 165 | 103 | 34 | 79 | 119 |
| Griffin Jax | 2020-2022 | 3 | 4 | .429 | 4.04 | 26 | 6 | 0 | 0 | 1 | 62.1 | 65 | 28 | 11 | 20 | 46 |
| Tyler Jay | 2018-2018 | 3 | 3 | .500 | 4.91 | 20 | 0 | 0 | 0 | 9 | 22.0 | 24 | 12 | 0 | 12 | 26 |
| Trey Jeans | 2020-2020 | 0 | 6 | .000 | 12.31 | 41 | 0 | 0 | 0 | 2 | 45.1 | 74 | 62 | 13 | 54 | 19 |
| Michael Jefferson | 2014-2016 | 7 | 5 | .583 | 8.46 | 91 | 0 | 0 | 0 | 3 | 121.1 | 160 | 114 | 17 | 116 | 53 |
| Ryan Jensen | 2022-2023 | 10 | 12 | .455 | 3.47 | 72 | 29 | 0 | 0 | 5 | 207.2 | 181 | 80 | 17 | 100 | 211 |
| Kevin Jepsen | 2017-2017 | 0 | 0 | .000 | 6.35 | 9 | 0 | 0 | 0 | 0 | 11.1 | 15 | 8 | 3 | 10 | 18 |
| Williams Jerez | 2018-2019 | 1 | 2 | .333 | 4.67 | 45 | 0 | 0 | 0 | 1 | 54.0 | 56 | 28 | 7 | 29 | 53 |
| Nick Jobst | 2018-2018 | 1 | 2 | .333 | 8.10 | 23 | 0 | 0 | 0 | 4 | 26.2 | 23 | 24 | 3 | 27 | 23 |
| MD Johnson | 2023-2023 | 0 | 0 | .000 | 3.71 | 9 | 0 | 0 | 0 | 0 | 17.0 | 13 | 7 | 0 | 15 | 16 |
| Pierce Johnson | 2018-2020 | 1 | 4 | .200 | 4.43 | 29 | 2 | 0 | 0 | 3 | 44.2 | 30 | 22 | 5 | 40 | 59 |
| Sherman Johnson | 2018-2022 | 0 | 0 | .000 | 27.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 4 | 3 | 0 | 2 | 2 |
| Stephen Johnson | 2017-2018 | 4 | 2 | .667 | 4.87 | 44 | 0 | 0 | 0 | 2 | 57.1 | 65 | 31 | 4 | 39 | 62 |
| Eric Jokisch | 2014-2018 | 38 | 25 | .603 | 4.90 | 148 | 65 | 1 | 0 | 3 | 472.1 | 523 | 257 | 71 | 192 | 387 |
| Chris Jones | 2016-2016 | 2 | 1 | .667 | 5.49 | 36 | 1 | 0 | 0 | 0 | 62.1 | 61 | 38 | 12 | 41 | 70 |
| Damon Jones | 2021-2022 | 2 | 5 | .286 | 1.83 | 53 | 1 | 0 | 0 | 3 | 98.1 | 66 | 20 | 5 | 39 | 117 |
| Jared Jones | 2023-2023 | 5 | 6 | .455 | 4.91 | 13 | 13 | 0 | 0 | 0 | 73.1 | 72 | 40 | 21 | 29 | 60 |
| Spencer Jones | 2020-2021 | 5 | 3 | .625 | 5.26 | 74 | 0 | 0 | 0 | 1 | 89.0 | 91 | 52 | 9 | 48 | 89 |
| Zachary Jones | 2018-2019 | 4 | 3 | .571 | 4.37 | 39 | 1 | 0 | 0 | 0 | 80.1 | 71 | 39 | 10 | 70 | 91 |
| Mitchell Jordan | 2019-2020 | 1 | 1 | .500 | 4.15 | 6 | 3 | 0 | 0 | 0 | 17.1 | 18 | 8 | 1 | 10 | 7 |
| Ariel Jurado | 2020-2022 | 2 | 3 | .400 | 4.81 | 18 | 5 | 0 | 0 | 0 | 43.0 | 50 | 23 | 7 | 18 | 26 |
