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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 | 0-2019 | 7 | 7 | .500 | 4.98 | 20 | 20 | 1 | 0 | 0 | 133.2 | 152 | 74 | 23 | 55 | 96 |
| Ricky Jackson | 0-2 | 11 | 7 | .611 | 4.03 | 24 | 24 | 1 | 1 | 0 | 154.0 | 144 | 69 | 18 | 53 | 99 |
| Gerd Jans | -1-2016 | 2 | 3 | .400 | 5.75 | 50 | 0 | 0 | 0 | 0 | 83.0 | 86 | 53 | 12 | 50 | 53 |
| Edward Jensen | 0-0 | 1 | 1 | .500 | 12.64 | 22 | 0 | 0 | 0 | 0 | 31.1 | 57 | 44 | 13 | 19 | 24 |
| Félix Jiménez | 1-2018 | 13 | 15 | .464 | 5.80 | 36 | 33 | 2 | 0 | 0 | 206.1 | 199 | 133 | 43 | 113 | 285 |
| Mario Jiménez | -1-2014 | 9 | 3 | .750 | 5.18 | 78 | 1 | 0 | 0 | 2 | 106.0 | 124 | 61 | 19 | 38 | 82 |
| Cole Johnson | 4-0 | 22 | 27 | .449 | 4.83 | 108 | 104 | 1 | 1 | 0 | 505.1 | 563 | 271 | 57 | 194 | 375 |
| Denver Johnston | 0-2017 | 3 | 1 | .750 | 3.51 | 25 | 0 | 0 | 0 | 0 | 51.1 | 46 | 20 | 4 | 27 | 26 |
| Walt Johnston | 0-2021 | 0 | 0 | .000 | 2.16 | 2 | 2 | 0 | 0 | 0 | 8.1 | 6 | 2 | 0 | 5 | 7 |
| Barry Jones | 2-2021 | 18 | 10 | .643 | 3.53 | 214 | 0 | 0 | 0 | 43 | 201.2 | 185 | 79 | 19 | 115 | 237 |
| Bryan Jones | 0-2024 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 1 | 4 |
| John Jones | 1-2015 | 7 | 6 | .538 | 4.20 | 58 | 14 | 0 | 0 | 5 | 152.0 | 166 | 71 | 17 | 55 | 114 |
| Tom Jones | 3-2023 | 14 | 9 | .609 | 4.29 | 38 | 36 | 1 | 1 | 0 | 230.2 | 250 | 110 | 25 | 94 | 170 |
| Greg Jordan | 0-2025 | 0 | 2 | .000 | 10.50 | 14 | 0 | 0 | 0 | 1 | 18.0 | 22 | 21 | 7 | 11 | 16 |
| Mimosa Joseph | 0-2025 | 2 | 2 | .500 | 1.57 | 4 | 4 | 0 | 0 | 0 | 28.2 | 16 | 5 | 1 | 7 | 28 |
| Johnny Joyce | 0-2022 | 6 | 8 | .429 | 6.46 | 53 | 0 | 0 | 0 | 4 | 54.1 | 84 | 39 | 4 | 37 | 15 |
| Juan Júlio | 0-2019 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 1 | 1.0 | 1 | 0 | 0 | 0 | 1 |
