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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 | 2016-2016 | 1 | 0 | 1.000 | 1.46 | 8 | 0 | 0 | 0 | 1 | 12.1 | 9 | 2 | 0 | 3 | 12 |
| Jason Jackson | 2019-2021 | 7 | 22 | .241 | 6.22 | 42 | 33 | 2 | 0 | 0 | 202.2 | 271 | 140 | 17 | 107 | 129 |
| Leroy Jackson | 2016-2018 | 4 | 4 | .500 | 7.02 | 22 | 15 | 0 | 0 | 0 | 75.2 | 109 | 59 | 11 | 34 | 77 |
| Ed Jacobs | 2019-2021 | 13 | 19 | .406 | 6.05 | 62 | 45 | 2 | 1 | 8 | 258.2 | 300 | 174 | 23 | 134 | 183 |
| Justin Jamerson | 2015-2015 | 0 | 0 | .000 | 5.00 | 7 | 0 | 0 | 0 | 0 | 9.0 | 14 | 5 | 2 | 2 | 11 |
| Gerd Jans | 2015-2016 | 2 | 6 | .250 | 6.39 | 51 | 7 | 0 | 0 | 7 | 74.2 | 100 | 53 | 17 | 32 | 63 |
| Augusto Jaramillo | 2020-2020 | 0 | 1 | .000 | 2.70 | 12 | 0 | 0 | 0 | 0 | 10.0 | 9 | 3 | 1 | 5 | 10 |
| Raśl Javier | 2015-2015 | 3 | 0 | 1.000 | 6.29 | 22 | 0 | 0 | 0 | 0 | 44.1 | 53 | 31 | 9 | 14 | 28 |
| Rudy Jenkins | 2018-2018 | 1 | 16 | .059 | 7.09 | 25 | 25 | 0 | 0 | 0 | 120.2 | 184 | 95 | 23 | 67 | 101 |
| Bill Jensen | 2013-2016 | 1 | 0 | 1.000 | 7.50 | 24 | 3 | 0 | 0 | 0 | 42.0 | 62 | 35 | 8 | 22 | 24 |
| Joe Johnson | 2016-2016 | 2 | 2 | .500 | 4.91 | 39 | 0 | 0 | 0 | 0 | 51.1 | 67 | 28 | 7 | 28 | 39 |
| Denver Johnston | 2017-2021 | 2 | 1 | .667 | 6.27 | 18 | 0 | 0 | 0 | 1 | 18.2 | 21 | 13 | 2 | 12 | 16 |
| Jim Johnstone | 2020-2020 | 0 | 0 | .000 | 7.94 | 4 | 0 | 0 | 0 | 0 | 5.2 | 4 | 5 | 0 | 8 | 5 |
| Gary Jones | 2016-2020 | 13 | 8 | .619 | 5.88 | 86 | 0 | 0 | 0 | 11 | 127.0 | 169 | 83 | 26 | 36 | 102 |
| Steven Jones | 2020-2020 | 1 | 5 | .167 | 7.34 | 24 | 0 | 0 | 0 | 3 | 41.2 | 53 | 34 | 4 | 30 | 27 |
