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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jay Jackson | 2016-2025 | 8 | 2 | .800 | 3.58 | 62 | 0 | 0 | 0 | 2 | 105.2 | 105 | 42 | 12 | 44 | 91 |
| Jaun Jaime | 2013-2014 | 5 | 6 | .455 | 3.59 | 100 | 0 | 0 | 0 | 46 | 100.1 | 90 | 40 | 9 | 67 | 116 |
| Josh James | 2020-2025 | 5 | 4 | .556 | 6.31 | 47 | 1 | 0 | 0 | 0 | 87.0 | 93 | 61 | 7 | 60 | 75 |
| Drey Jameson | 2022-2022 | 6 | 5 | .545 | 4.80 | 19 | 15 | 1 | 0 | 0 | 84.1 | 87 | 45 | 15 | 31 | 69 |
| Jordan Jankowski | 2018-2018 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 4.0 | 2 | 0 | 0 | 5 | 4 |
| Mickey Jannis | 2016-2017 | 4 | 3 | .571 | 6.36 | 15 | 10 | 1 | 0 | 0 | 63.2 | 67 | 45 | 10 | 44 | 55 |
| Justin Jarvis | 2023-2023 | 0 | 0 | .000 | 7.30 | 3 | 3 | 0 | 0 | 0 | 12.1 | 18 | 10 | 4 | 8 | 11 |
| Cristian Javier | 2019-2020 | 6 | 2 | .750 | 5.83 | 28 | 24 | 0 | 0 | 0 | 117.1 | 113 | 76 | 21 | 91 | 102 |
| Jeremy Jeffress | 2021-2021 | 3 | 5 | .375 | 5.61 | 45 | 0 | 0 | 0 | 3 | 69.0 | 96 | 43 | 7 | 25 | 50 |
| Tyrell Jenkins | 2014-2014 | 0 | 1 | .000 | 7.71 | 3 | 3 | 0 | 0 | 0 | 14.0 | 23 | 12 | 2 | 10 | 15 |
| Steven Jennings | 2024-2025 | 2 | 4 | .333 | 4.14 | 32 | 0 | 0 | 0 | 3 | 41.1 | 45 | 19 | 3 | 12 | 34 |
| Dan Jensen | 2016-2016 | 0 | 1 | .000 | 13.41 | 36 | 0 | 0 | 0 | 1 | 48.1 | 95 | 72 | 14 | 35 | 7 |
| Bud Jeter | 2018-2019 | 2 | 0 | 1.000 | 6.47 | 22 | 0 | 0 | 0 | 0 | 32.0 | 38 | 23 | 7 | 29 | 36 |
| Jin-De Jhang | 2019-2021 | 0 | 0 | .000 | 45.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 4 | 5 | 0 | 4 | 0 |
| Dany Jimenez | 2022-2025 | 8 | 14 | .364 | 5.81 | 83 | 0 | 0 | 0 | 13 | 105.1 | 105 | 68 | 19 | 62 | 101 |
| Ubaldo Jimenez | 2020-2020 | 0 | 0 | .000 | 36.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 4 | 4 | 0 | 1 | 0 |
| Jackson Jobe | 2025-2025 | 0 | 1 | .000 | 6.75 | 1 | 0 | 0 | 0 | 0 | 2.2 | 2 | 2 | 0 | 4 | 0 |
| Chris Johnson | 2016-2017 | 2 | 4 | .333 | 8.48 | 77 | 0 | 0 | 0 | 2 | 127.1 | 194 | 120 | 19 | 91 | 69 |
| Erik Johnson | 2013-2014 | 5 | 3 | .625 | 4.42 | 18 | 18 | 0 | 0 | 0 | 97.2 | 99 | 48 | 15 | 50 | 78 |
| Jonathan Johnson | 2017-2019 | 0 | 0 | .000 | 21.60 | 2 | 0 | 0 | 0 | 0 | 1.2 | 4 | 4 | 0 | 2 | 0 |
| Pierce Johnson | 2015-2017 | 17 | 14 | .548 | 4.45 | 46 | 46 | 0 | 0 | 0 | 238.2 | 252 | 118 | 29 | 105 | 220 |
| Ty Johnson | 2025-2025 | 2 | 4 | .333 | 5.82 | 12 | 12 | 0 | 0 | 0 | 60.1 | 66 | 39 | 11 | 42 | 54 |
| Chase Johnson-Mullins | 2018-2019 | 0 | 1 | .000 | 6.16 | 30 | 0 | 0 | 0 | 2 | 38.0 | 47 | 26 | 4 | 17 | 31 |
| Christian Jones | 2015-2017 | 6 | 7 | .462 | 5.54 | 101 | 0 | 0 | 0 | 4 | 170.2 | 177 | 105 | 15 | 125 | 127 |
| Connor W. Jones | 2019-2021 | 5 | 5 | .500 | 5.63 | 78 | 0 | 0 | 0 | 1 | 115.0 | 129 | 72 | 6 | 88 | 75 |
| Nate Jones | 2015-2015 | 1 | 0 | 1.000 | 2.02 | 25 | 0 | 0 | 0 | 1 | 26.2 | 14 | 6 | 1 | 9 | 34 |
| Felix Jorge | 2015-2016 | 4 | 11 | .267 | 5.61 | 20 | 20 | 0 | 0 | 0 | 101.0 | 119 | 63 | 13 | 51 | 62 |
| Elison Joseph | 2024-2024 | 1 | 0 | 1.000 | 1.35 | 20 | 0 | 0 | 0 | 5 | 20.0 | 12 | 3 | 1 | 15 | 30 |
| Ben Joyce | 2022-2022 | 1 | 0 | 1.000 | 2.08 | 13 | 0 | 0 | 0 | 1 | 13.0 | 11 | 3 | 0 | 4 | 20 |
| Jake Joyce | 2016-2016 | 0 | 4 | .000 | 7.61 | 53 | 0 | 0 | 0 | 0 | 60.1 | 54 | 51 | 8 | 59 | 45 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Jorge Juan | 2023-2023 | 4 | 5 | .444 | 5.26 | 16 | 16 | 0 | 0 | 0 | 78.2 | 78 | 46 | 14 | 59 | 74 |
| Hayden Juenger | 2024-2024 | 5 | 4 | .556 | 5.44 | 19 | 19 | 0 | 0 | 0 | 84.1 | 90 | 51 | 18 | 48 | 68 |
| Erick Julio | 2022-2022 | 4 | 7 | .364 | 6.92 | 27 | 15 | 0 | 0 | 0 | 104.0 | 124 | 80 | 30 | 48 | 82 |
| Taylor Jungmann | 2014-2014 | 4 | 2 | .667 | 6.38 | 11 | 11 | 1 | 0 | 0 | 60.2 | 70 | 43 | 11 | 22 | 54 |
| Jakob Junis | 2017-2017 | 9 | 4 | .692 | 3.94 | 27 | 27 | 0 | 0 | 0 | 148.1 | 165 | 65 | 29 | 63 | 127 |
| Ariel Jurado | 2016-2018 | 6 | 9 | .400 | 4.43 | 39 | 15 | 0 | 0 | 11 | 105.2 | 129 | 52 | 14 | 42 | 64 |
