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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 | 2018-2018 | 9 | 4 | .692 | 2.44 | 16 | 16 | 0 | 0 | 0 | 125.2 | 98 | 34 | 5 | 54 | 151 |
| Luke Jackson | 2019-2023 | 13 | 6 | .684 | 4.85 | 154 | 0 | 0 | 0 | 1 | 172.2 | 173 | 93 | 25 | 85 | 219 |
| Josh James | 2020-2023 | 8 | 3 | .727 | 3.91 | 63 | 1 | 0 | 0 | 2 | 94.1 | 70 | 41 | 15 | 46 | 146 |
| Drey Jameson | 2023-2023 | 11 | 5 | .688 | 4.64 | 30 | 30 | 0 | 0 | 0 | 155.1 | 169 | 80 | 22 | 62 | 132 |
| Kenley Jansen | 2019-2022 | 15 | 9 | .625 | 4.09 | 207 | 0 | 0 | 0 | 8 | 207.0 | 175 | 94 | 26 | 89 | 261 |
| Cristian Javier | 2022-2023 | 16 | 14 | .533 | 4.87 | 83 | 29 | 0 | 0 | 5 | 205.1 | 196 | 111 | 45 | 94 | 245 |
| Griffin Jax | 2021-2023 | 8 | 10 | .444 | 5.37 | 38 | 19 | 1 | 0 | 1 | 125.2 | 147 | 75 | 14 | 43 | 94 |
| Tyler Jay | 2020-2020 | 0 | 0 | .000 | 3.12 | 7 | 0 | 0 | 0 | 0 | 8.2 | 9 | 3 | 0 | 2 | 11 |
| Daulton Jefferies | 2022-2023 | 10 | 23 | .303 | 6.36 | 49 | 49 | 1 | 0 | 0 | 235.0 | 284 | 166 | 49 | 79 | 188 |
| Ryan Jeffers | 2018-2023 | 7 | 2 | .778 | 2.05 | 13 | 13 | 0 | 0 | 0 | 88.0 | 73 | 20 | 4 | 21 | 85 |
| Jeremy Jeffress | 2020-2020 | 0 | 0 | .000 | 4.50 | 2 | 0 | 0 | 0 | 0 | 4.0 | 3 | 2 | 1 | 0 | 3 |
| Greyson Jenista | 2018-2018 | 7 | 3 | .700 | 2.00 | 14 | 14 | 0 | 0 | 0 | 103.2 | 74 | 23 | 5 | 41 | 150 |
| Dan Jennings | 2019-2019 | 5 | 5 | .500 | 4.39 | 73 | 7 | 0 | 0 | 1 | 96.1 | 91 | 47 | 9 | 48 | 66 |
| Ryan Jensen | 2022-2023 | 5 | 5 | .500 | 5.89 | 51 | 8 | 0 | 0 | 0 | 88.2 | 96 | 58 | 22 | 61 | 67 |
| Dany Jimenez | 2023-2023 | 2 | 3 | .400 | 2.33 | 46 | 0 | 0 | 0 | 2 | 54.0 | 40 | 14 | 4 | 35 | 62 |
| Joe Jimenez | 2019-2023 | 12 | 10 | .545 | 2.49 | 157 | 0 | 0 | 0 | 43 | 170.0 | 119 | 47 | 11 | 70 | 215 |
| Brian Johnson | 2019-2019 | 0 | 5 | .000 | 8.13 | 8 | 6 | 0 | 0 | 0 | 31.0 | 39 | 28 | 6 | 21 | 20 |
| Osiris Johnson | 2018-2018 | 4 | 0 | 1.000 | 0.52 | 12 | 6 | 0 | 0 | 0 | 51.2 | 29 | 3 | 1 | 6 | 89 |
| Pierce Johnson | 2021-2021 | 2 | 0 | 1.000 | 6.19 | 51 | 0 | 0 | 0 | 3 | 52.1 | 62 | 36 | 9 | 42 | 56 |
| Seth Johnson | 2023-2023 | 5 | 3 | .625 | 3.03 | 60 | 0 | 0 | 0 | 0 | 89.0 | 64 | 30 | 7 | 41 | 96 |
| Connor Jones | 2020-2020 | 0 | 1 | .000 | 9.00 | 3 | 3 | 0 | 0 | 0 | 11.0 | 14 | 11 | 2 | 10 | 8 |
| Jakob Junis | 2019-2023 | 7 | 9 | .438 | 5.81 | 34 | 24 | 0 | 0 | 0 | 155.0 | 181 | 100 | 33 | 46 | 120 |
| Janson Junk | 2023-2023 | 1 | 3 | .250 | 6.17 | 7 | 4 | 0 | 0 | 0 | 23.1 | 20 | 16 | 5 | 10 | 20 |
