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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 | 1 | .500 | 5.23 | 20 | 0 | 0 | 0 | 1 | 20.2 | 18 | 12 | 2 | 13 | 13 |
| An Jang-Yop | 2029-2031 | 7 | 3 | .700 | 1.11 | 62 | 0 | 0 | 0 | 28 | 105.0 | 59 | 13 | 4 | 35 | 164 |
| Maxime Janssens | 2029-2031 | 2 | 1 | .667 | 2.82 | 23 | 3 | 0 | 0 | 0 | 60.2 | 45 | 19 | 5 | 16 | 53 |
| Augusto Jaramillo | 2014-2018 | 4 | 10 | .286 | 2.98 | 96 | 0 | 0 | 0 | 53 | 87.2 | 82 | 29 | 9 | 45 | 85 |
| Bill Jensen | 2019-2021 | 4 | 7 | .364 | 5.20 | 71 | 11 | 0 | 0 | 0 | 136.2 | 158 | 79 | 17 | 45 | 73 |
| Esteban Jiménez | 2028-2031 | 0 | 1 | .000 | 4.91 | 9 | 0 | 0 | 0 | 1 | 11.0 | 10 | 6 | 2 | 7 | 11 |
| Félix Jiménez | 2018-2028 | 35 | 34 | .507 | 4.22 | 115 | 102 | 5 | 3 | 2 | 686.0 | 557 | 322 | 94 | 343 | 806 |
| Ji Jing | 2027-2029 | 30 | 19 | .612 | 3.54 | 60 | 60 | 7 | 3 | 0 | 406.2 | 395 | 160 | 28 | 157 | 294 |
| Ton Jobse | 2031-2031 | 3 | 6 | .333 | 5.21 | 13 | 13 | 0 | 0 | 0 | 77.2 | 91 | 45 | 7 | 51 | 71 |
| Joe Johnson | 2019-2021 | 6 | 1 | .857 | 6.24 | 48 | 0 | 0 | 0 | 1 | 53.1 | 67 | 37 | 11 | 31 | 41 |
| Myron Johnson | 2014-2019 | 24 | 18 | .571 | 4.47 | 62 | 56 | 0 | 0 | 0 | 350.2 | 354 | 174 | 46 | 114 | 325 |
| William Johnson | 2017-2017 | 3 | 1 | .750 | 3.76 | 6 | 6 | 0 | 0 | 0 | 38.1 | 37 | 16 | 6 | 5 | 35 |
| Denver Johnston | 2015-2018 | 11 | 9 | .550 | 6.02 | 131 | 0 | 0 | 0 | 6 | 154.0 | 150 | 103 | 27 | 89 | 125 |
| Walt Johnston | 2014-2019 | 27 | 24 | .529 | 4.27 | 123 | 40 | 6 | 2 | 8 | 354.1 | 324 | 168 | 42 | 127 | 239 |
| Barry Jones | 2023-2028 | 9 | 4 | .692 | 3.51 | 77 | 0 | 0 | 0 | 2 | 97.1 | 90 | 38 | 8 | 42 | 83 |
| Bryan Jones | 2023-2024 | 0 | 3 | .000 | 4.54 | 48 | 0 | 0 | 0 | 5 | 41.2 | 38 | 21 | 5 | 19 | 35 |
| Gary Jones | 2021-2022 | 2 | 1 | .667 | 7.56 | 8 | 2 | 0 | 0 | 0 | 25.0 | 34 | 21 | 1 | 11 | 13 |
| Harrison Jones | 2020-2020 | 0 | 4 | .000 | 10.38 | 12 | 3 | 0 | 0 | 0 | 21.2 | 31 | 25 | 5 | 10 | 28 |
| Mike Jones | 2014-2015 | 3 | 11 | .214 | 6.13 | 17 | 17 | 0 | 0 | 0 | 83.2 | 109 | 57 | 11 | 32 | 74 |
| Ralph Jones | 2016-2016 | 3 | 4 | .429 | 5.00 | 22 | 8 | 0 | 0 | 0 | 63.0 | 59 | 35 | 9 | 22 | 44 |
| Tom Jones | 2023-2023 | 1 | 5 | .167 | 7.38 | 12 | 11 | 0 | 0 | 0 | 39.0 | 38 | 32 | 4 | 39 | 29 |
| Greg Jordan | 2018-2027 | 4 | 5 | .444 | 3.42 | 97 | 0 | 0 | 0 | 18 | 100.0 | 82 | 38 | 7 | 63 | 83 |
| Mimosa Joseph | 2023-2028 | 21 | 18 | .538 | 3.37 | 55 | 55 | 7 | 2 | 0 | 363.2 | 352 | 136 | 39 | 77 | 249 |
| José Juárez | 2025-2029 | 3 | 4 | .429 | 4.68 | 12 | 8 | 2 | 0 | 0 | 59.2 | 55 | 31 | 6 | 25 | 48 |
| Juan Júlio | 2018-2026 | 7 | 9 | .438 | 4.07 | 22 | 22 | 1 | 0 | 0 | 135.0 | 140 | 61 | 11 | 35 | 67 |
