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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 | 2019-2019 | 1 | 1 | .500 | 6.14 | 22 | 0 | 0 | 0 | 0 | 36.2 | 43 | 25 | 6 | 16 | 38 |
| Leroy Jackson | 2017-2018 | 4 | 11 | .267 | 6.15 | 21 | 19 | 1 | 0 | 0 | 98.0 | 101 | 67 | 16 | 57 | 110 |
| Nate Jackson | 2032-2032 | 1 | 0 | 1.000 | 1.00 | 1 | 1 | 1 | 0 | 0 | 9.0 | 6 | 1 | 0 | 0 | 13 |
| Ed Jacobs | 2018-2020 | 12 | 7 | .632 | 3.10 | 51 | 13 | 4 | 1 | 4 | 139.1 | 136 | 48 | 9 | 64 | 95 |
| Justin Jamerson | 2015-2023 | 15 | 13 | .536 | 5.86 | 148 | 18 | 0 | 0 | 7 | 262.2 | 309 | 171 | 35 | 119 | 227 |
| An Jang-Yop | 2024-2025 | 2 | 1 | .667 | 1.85 | 46 | 0 | 0 | 0 | 28 | 43.2 | 26 | 9 | 2 | 25 | 67 |
| Gerd Jans | 2015-2015 | 1 | 1 | .500 | 6.06 | 9 | 0 | 0 | 0 | 0 | 16.1 | 20 | 11 | 1 | 9 | 13 |
| Raúl Javier | 2015-2016 | 1 | 0 | 1.000 | 4.30 | 13 | 0 | 0 | 0 | 0 | 23.0 | 30 | 11 | 3 | 9 | 18 |
| Rudy Jenkins | 2019-2021 | 15 | 18 | .455 | 3.49 | 55 | 45 | 1 | 0 | 0 | 294.1 | 289 | 114 | 27 | 118 | 273 |
| Esteban Jiménez | 2027-2027 | 1 | 0 | 1.000 | 1.94 | 37 | 0 | 0 | 0 | 12 | 46.1 | 41 | 10 | 3 | 17 | 60 |
| Félix Jiménez | 2030-2030 | 7 | 5 | .583 | 4.13 | 21 | 21 | 0 | 0 | 0 | 124.1 | 120 | 57 | 11 | 47 | 142 |
| Francisco Jiménez | 2027-2030 | 5 | 10 | .333 | 4.93 | 85 | 27 | 0 | 0 | 1 | 204.2 | 232 | 112 | 19 | 132 | 162 |
| Miguel Jiménez | 2024-2031 | 0 | 1 | .000 | 2.86 | 14 | 0 | 0 | 0 | 1 | 28.1 | 23 | 9 | 2 | 14 | 16 |
| Ji Jing | 2032-2032 | 0 | 0 | .000 | 1.23 | 8 | 0 | 0 | 0 | 0 | 7.1 | 6 | 1 | 0 | 1 | 6 |
| Franklin Johnson | 2015-2024 | 6 | 5 | .545 | 6.11 | 108 | 0 | 0 | 0 | 14 | 129.2 | 195 | 88 | 22 | 52 | 116 |
| Jim Johnstone | 2020-2020 | 0 | 1 | .000 | 12.15 | 3 | 0 | 0 | 0 | 0 | 6.2 | 12 | 9 | 2 | 7 | 5 |
| Nate Johnstone | 2034-2034 | 0 | 0 | .000 | 4.61 | 4 | 0 | 0 | 0 | 0 | 13.2 | 14 | 7 | 1 | 10 | 8 |
| Gary Jones | 2015-2015 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 3.0 | 1 | 0 | 0 | 0 | 4 |
| Steven Jones | 2019-2024 | 3 | 4 | .429 | 3.13 | 68 | 0 | 0 | 0 | 12 | 89.0 | 70 | 31 | 4 | 46 | 66 |
| Teddy Jones | 2017-2019 | 17 | 18 | .486 | 4.54 | 69 | 43 | 2 | 0 | 5 | 291.1 | 293 | 147 | 27 | 127 | 310 |
| Gary Jordan | 2033-2033 | 0 | 1 | .000 | 3.38 | 3 | 3 | 1 | 0 | 0 | 16.0 | 15 | 6 | 0 | 8 | 10 |
| Mimosa Joseph | 2022-2022 | 3 | 2 | .600 | 3.44 | 6 | 6 | 0 | 0 | 0 | 34.0 | 39 | 13 | 0 | 13 | 26 |
| Otto Joseph | 2031-2031 | 6 | 2 | .750 | 3.06 | 14 | 8 | 0 | 0 | 0 | 61.2 | 50 | 21 | 3 | 22 | 41 |
| Jose Jovellanos | 2034-2034 | 0 | 2 | .000 | 7.94 | 3 | 3 | 0 | 0 | 0 | 11.1 | 22 | 10 | 2 | 5 | 3 |
| Jack Joyner | 2032-2033 | 8 | 13 | .381 | 4.64 | 34 | 34 | 0 | 0 | 0 | 186.1 | 187 | 96 | 10 | 96 | 132 |
| José Juárez | 2023-2024 | 3 | 5 | .375 | 3.90 | 57 | 0 | 0 | 0 | 27 | 60.0 | 61 | 26 | 4 | 22 | 50 |
| José Juárez | 2023-2023 | 1 | 0 | 1.000 | 2.25 | 1 | 1 | 0 | 0 | 0 | 8.0 | 7 | 2 | 1 | 2 | 3 |
| Fernando Júlio | 2028-2029 | 6 | 6 | .500 | 2.76 | 55 | 1 | 0 | 0 | 4 | 104.1 | 95 | 32 | 4 | 41 | 89 |
| Behar Jusufi | 2029-2033 | 18 | 8 | .692 | 3.35 | 45 | 32 | 1 | 0 | 1 | 225.2 | 206 | 84 | 15 | 98 | 172 |
