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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jason Jackson | 2017-2018 | 11 | 9 | .550 | 6.22 | 58 | 29 | 0 | 0 | 0 | 196.2 | 257 | 136 | 34 | 94 | 164 |
| Ed Jacobs | 2023-2024 | 10 | 11 | .476 | 4.45 | 53 | 21 | 0 | 0 | 4 | 190.0 | 209 | 94 | 15 | 96 | 111 |
| Gerd Jans | 2017-2021 | 11 | 9 | .550 | 6.86 | 118 | 0 | 0 | 0 | 4 | 160.0 | 233 | 122 | 26 | 81 | 142 |
| Bill Jensen | 2017-2017 | 0 | 1 | .000 | 6.75 | 11 | 0 | 0 | 0 | 1 | 13.1 | 19 | 10 | 3 | 7 | 12 |
| Edward Jensen | 2015-2021 | 2 | 9 | .182 | 11.34 | 45 | 7 | 0 | 0 | 1 | 60.1 | 98 | 76 | 13 | 46 | 29 |
| Mario Jiménez | 2021-2021 | 0 | 1 | .000 | 21.60 | 8 | 0 | 0 | 0 | 0 | 1.2 | 3 | 4 | 0 | 1 | 1 |
| Cole Johnson | 2021-2021 | 4 | 5 | .444 | 4.55 | 19 | 19 | 1 | 0 | 0 | 110.2 | 127 | 56 | 7 | 49 | 69 |
| Joe Johnson | 2017-2020 | 4 | 6 | .400 | 6.63 | 45 | 4 | 1 | 0 | 0 | 74.2 | 100 | 55 | 12 | 44 | 50 |
| Myron Johnson | 2020-2020 | 2 | 8 | .200 | 7.68 | 14 | 10 | 0 | 0 | 0 | 68.0 | 93 | 58 | 10 | 38 | 32 |
| Denver Johnston | 2015-2023 | 10 | 9 | .526 | 6.51 | 130 | 0 | 0 | 0 | 1 | 167.1 | 210 | 121 | 22 | 105 | 142 |
| Jim Johnstone | 2017-2019 | 10 | 23 | .303 | 7.14 | 42 | 40 | 1 | 1 | 1 | 223.0 | 327 | 177 | 44 | 104 | 152 |
| Bryan Jones | 2024-2024 | 0 | 1 | .000 | 13.50 | 11 | 0 | 0 | 0 | 1 | 9.1 | 18 | 14 | 1 | 10 | 10 |
| Gary Jones | 2019-2024 | 7 | 7 | .500 | 4.14 | 77 | 7 | 1 | 0 | 11 | 154.1 | 177 | 71 | 12 | 56 | 87 |
| Harrison Jones | 2020-2020 | 5 | 0 | 1.000 | 2.37 | 10 | 9 | 1 | 1 | 0 | 64.2 | 57 | 17 | 6 | 9 | 48 |
| Mike Jones | 2015-2015 | 0 | 0 | .000 | 4.50 | 5 | 0 | 0 | 0 | 0 | 6.0 | 9 | 3 | 1 | 5 | 10 |
| Tom Jones | 2023-2023 | 1 | 3 | .250 | 7.83 | 5 | 5 | 0 | 0 | 0 | 23.0 | 31 | 20 | 4 | 9 | 14 |
| Mimosa Joseph | 2023-2023 | 0 | 1 | .000 | 2.08 | 2 | 2 | 0 | 0 | 0 | 8.2 | 7 | 2 | 0 | 2 | 5 |
| José Juárez | 2024-2024 | 4 | 11 | .267 | 5.64 | 16 | 16 | 5 | 0 | 0 | 111.2 | 113 | 70 | 11 | 52 | 72 |
