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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frank Jackson | 2015-2016 | 1 | 1 | .500 | 4.65 | 35 | 0 | 0 | 0 | 0 | 50.1 | 48 | 26 | 3 | 25 | 42 |
| Ricky Jackson | 2020-2021 | 5 | 13 | .278 | 3.79 | 62 | 16 | 0 | 0 | 21 | 145.0 | 151 | 61 | 12 | 59 | 100 |
| Timothy Jackson | 2015-2021 | 7 | 15 | .318 | 5.14 | 80 | 20 | 2 | 1 | 3 | 211.2 | 256 | 121 | 20 | 72 | 124 |
| Justin Jamerson | 2016-2021 | 0 | 1 | .000 | 5.06 | 21 | 0 | 0 | 0 | 1 | 37.1 | 38 | 21 | 5 | 18 | 38 |
| Rudy Jenkins | 2016-2016 | 0 | 0 | .000 | 2.00 | 3 | 0 | 0 | 0 | 0 | 9.0 | 12 | 2 | 1 | 2 | 10 |
| Bill Jensen | 2018-2018 | 0 | 0 | .000 | 4.41 | 13 | 0 | 0 | 0 | 0 | 16.1 | 16 | 8 | 3 | 5 | 8 |
| Edward Jensen | 2015-2016 | 3 | 2 | .600 | 2.98 | 36 | 0 | 0 | 0 | 0 | 51.1 | 45 | 17 | 3 | 31 | 49 |
| Mario Jiménez | 2021-2021 | 1 | 0 | 1.000 | 3.57 | 9 | 0 | 0 | 0 | 1 | 17.2 | 10 | 7 | 3 | 8 | 10 |
| Cole Johnson | 2021-2021 | 3 | 3 | .500 | 3.74 | 7 | 7 | 0 | 0 | 0 | 43.1 | 46 | 18 | 0 | 15 | 24 |
| Donald Johnson | 2017-2018 | 6 | 7 | .462 | 4.04 | 74 | 0 | 0 | 0 | 11 | 64.2 | 72 | 29 | 4 | 45 | 73 |
| Franklin Johnson | 2019-2019 | 0 | 0 | .000 | 6.17 | 5 | 0 | 0 | 0 | 0 | 11.2 | 16 | 8 | 1 | 11 | 10 |
| James Johnson | 2017-2018 | 7 | 9 | .438 | 4.46 | 77 | 15 | 0 | 0 | 1 | 149.1 | 153 | 74 | 17 | 77 | 129 |
| Denver Johnston | 2015-2016 | 0 | 0 | .000 | 0.00 | 4 | 0 | 0 | 0 | 0 | 2.2 | 1 | 0 | 0 | 3 | 5 |
| Jim Johnstone | 2017-2021 | 10 | 10 | .500 | 5.27 | 31 | 27 | 3 | 0 | 0 | 169.0 | 191 | 99 | 17 | 83 | 140 |
| Bryan Jones | 2020-2020 | 4 | 2 | .667 | 2.75 | 18 | 0 | 0 | 0 | 0 | 36.0 | 23 | 11 | 3 | 25 | 35 |
| Leon Jones | 2019-2019 | 1 | 5 | .167 | 8.04 | 12 | 9 | 0 | 0 | 0 | 47.0 | 76 | 42 | 12 | 27 | 17 |
| Steven Jones | 2021-2021 | 1 | 3 | .250 | 4.82 | 20 | 0 | 0 | 0 | 10 | 18.2 | 16 | 10 | 1 | 11 | 13 |
| Teddy Jones | 2020-2021 | 14 | 7 | .667 | 4.45 | 35 | 31 | 0 | 0 | 0 | 198.0 | 175 | 98 | 11 | 103 | 151 |
| Johnny Joyce | 2019-2020 | 4 | 2 | .667 | 4.68 | 20 | 6 | 0 | 0 | 0 | 57.2 | 65 | 30 | 3 | 17 | 45 |
| José Júlio | 2018-2018 | 1 | 1 | .500 | 5.35 | 18 | 0 | 0 | 0 | 0 | 38.2 | 45 | 23 | 3 | 19 | 39 |
