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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Andre Jackson | 2022-2022 | 0 | 0 | .000 | 1.42 | 3 | 0 | 0 | 0 | 0 | 6.1 | 3 | 1 | 0 | 3 | 3 |
| Jay Jackson | 2023-2025 | 6 | 7 | .462 | 3.95 | 87 | 0 | 0 | 0 | 37 | 111.2 | 111 | 49 | 17 | 37 | 106 |
| Dan Jagiello | 2018-2018 | 1 | 0 | 1.000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 3.2 | 2 | 0 | 0 | 3 | 2 |
| Eric Jagielo | 2019-2019 | 0 | 0 | .000 | 32.40 | 1 | 0 | 0 | 0 | 0 | 1.2 | 8 | 6 | 1 | 1 | 0 |
| Jaun Jaime | 2014-2016 | 10 | 12 | .455 | 4.73 | 121 | 0 | 0 | 0 | 27 | 125.2 | 93 | 66 | 11 | 88 | 170 |
| Christian James | 2021-2022 | 7 | 12 | .368 | 5.00 | 35 | 25 | 0 | 0 | 7 | 142.1 | 149 | 79 | 21 | 76 | 104 |
| Josh James | 2019-2020 | 4 | 1 | .800 | 5.18 | 24 | 17 | 0 | 0 | 1 | 97.1 | 100 | 56 | 10 | 46 | 86 |
| Drey Jameson | 2023-2025 | 20 | 24 | .455 | 4.45 | 94 | 53 | 2 | 0 | 2 | 419.0 | 437 | 207 | 51 | 130 | 309 |
| Thomas Jankins | 2019-2019 | 2 | 0 | 1.000 | 1.29 | 4 | 0 | 0 | 0 | 0 | 7.0 | 5 | 1 | 1 | 3 | 5 |
| Jordan Jankowski | 2017-2017 | 1 | 2 | .333 | 3.11 | 17 | 0 | 0 | 0 | 0 | 37.2 | 29 | 13 | 6 | 14 | 42 |
| Mickey Jannis | 2018-2022 | 23 | 35 | .397 | 5.82 | 125 | 69 | 4 | 0 | 1 | 541.0 | 687 | 350 | 79 | 216 | 231 |
| Bryce Jarvis | 2023-2024 | 14 | 7 | .667 | 4.29 | 51 | 29 | 0 | 0 | 1 | 226.1 | 224 | 108 | 33 | 91 | 139 |
| Justin Jarvis | 2024-2024 | 0 | 0 | .000 | 16.20 | 4 | 0 | 0 | 0 | 1 | 6.2 | 11 | 12 | 2 | 7 | 2 |
| Cristian Javier | 2021-2025 | 15 | 13 | .536 | 5.03 | 46 | 41 | 0 | 0 | 2 | 220.0 | 217 | 123 | 43 | 93 | 214 |
| Griffin Jax | 2020-2022 | 8 | 5 | .615 | 4.98 | 61 | 8 | 0 | 0 | 0 | 155.1 | 191 | 86 | 28 | 49 | 82 |
| Daulton Jefferies | 2020-2025 | 32 | 25 | .561 | 5.31 | 116 | 62 | 0 | 0 | 0 | 476.2 | 596 | 281 | 65 | 112 | 296 |
| Jeremy Jeffress | 2014-2015 | 7 | 5 | .583 | 3.89 | 76 | 0 | 0 | 0 | 12 | 85.2 | 60 | 37 | 9 | 49 | 116 |
| Chad Jenkins | 2014-2016 | 6 | 8 | .429 | 6.68 | 134 | 0 | 0 | 0 | 3 | 206.0 | 275 | 153 | 42 | 75 | 76 |
| Tyrell Jenkins | 2017-2017 | 6 | 9 | .400 | 4.66 | 22 | 21 | 0 | 0 | 0 | 106.1 | 123 | 55 | 12 | 54 | 88 |
| Dan Jennings | 2013-2013 | 4 | 6 | .400 | 4.11 | 57 | 0 | 0 | 0 | 27 | 61.1 | 69 | 28 | 5 | 35 | 61 |
| Chris Jensen | 2016-2016 | 1 | 3 | .250 | 6.32 | 6 | 6 | 0 | 0 | 0 | 31.1 | 37 | 22 | 5 | 17 | 20 |
| Williams Jerez | 2017-2017 | 1 | 0 | 1.000 | 18.00 | 1 | 0 | 0 | 0 | 0 | 2.0 | 5 | 4 | 2 | 0 | 3 |
| Jason Jester | 2016-2021 | 23 | 18 | .561 | 4.25 | 203 | 3 | 0 | 0 | 40 | 271.0 | 276 | 128 | 34 | 124 | 218 |
| Jake Jewell | 2020-2020 | 1 | 0 | 1.000 | 4.19 | 14 | 0 | 0 | 0 | 0 | 19.1 | 16 | 9 | 3 | 13 | 16 |
| Cole Johnson | 2017-2017 | 6 | 5 | .545 | 5.88 | 26 | 26 | 0 | 0 | 0 | 136.1 | 148 | 89 | 24 | 44 | 106 |
| Erik Johnson | 2014-2014 | 10 | 6 | .625 | 3.72 | 16 | 16 | 1 | 1 | 0 | 101.2 | 95 | 42 | 9 | 27 | 95 |
| Jeff Johnson | 2017-2018 | 1 | 0 | 1.000 | 14.21 | 5 | 0 | 0 | 0 | 0 | 6.1 | 11 | 10 | 2 | 7 | 6 |
| Pierce Johnson | 2023-2023 | 1 | 0 | 1.000 | 4.50 | 2 | 0 | 0 | 0 | 1 | 2.0 | 1 | 1 | 1 | 0 | 0 |
| Steven Johnson | 2014-2016 | 2 | 1 | .667 | 5.24 | 15 | 1 | 0 | 0 | 0 | 22.1 | 25 | 13 | 5 | 13 | 23 |
| Eric Jokisch | 2018-2023 | 47 | 18 | .723 | 3.97 | 105 | 86 | 1 | 1 | 1 | 577.2 | 602 | 255 | 57 | 151 | 434 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Connor W. Jones | 2020-2020 | 4 | 7 | .364 | 5.23 | 38 | 0 | 0 | 0 | 1 | 51.2 | 47 | 30 | 2 | 40 | 41 |
| Jared Jones | 2024-2025 | 3 | 6 | .333 | 6.10 | 14 | 13 | 0 | 0 | 0 | 69.1 | 80 | 47 | 11 | 38 | 52 |
| Nate Jones | 2015-2021 | 3 | 5 | .375 | 5.26 | 52 | 0 | 0 | 0 | 1 | 65.0 | 75 | 38 | 8 | 35 | 69 |
| Tyler Jones | 2018-2018 | 3 | 3 | .500 | 5.69 | 34 | 0 | 0 | 0 | 0 | 61.2 | 74 | 39 | 8 | 38 | 54 |
| Felix Jorge | 2015-2016 | 5 | 3 | .625 | 5.91 | 16 | 5 | 0 | 0 | 0 | 42.2 | 46 | 28 | 8 | 26 | 34 |
| Taylor Jungmann | 2017-2018 | 9 | 13 | .409 | 5.08 | 44 | 36 | 2 | 1 | 0 | 200.0 | 214 | 113 | 25 | 100 | 149 |
| Jakob Junis | 2018-2018 | 2 | 8 | .200 | 4.63 | 12 | 12 | 2 | 0 | 0 | 79.2 | 85 | 41 | 13 | 19 | 81 |
| Janson Junk | 2023-2023 | 2 | 0 | 1.000 | 4.41 | 11 | 0 | 0 | 0 | 0 | 16.1 | 18 | 8 | 0 | 7 | 11 |
| Jair Jurrjens | 2014-2016 | 19 | 19 | .500 | 4.06 | 63 | 55 | 1 | 0 | 2 | 367.2 | 387 | 166 | 33 | 109 | 247 |
