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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 |
| Nate Jackson | 2033-2034 | 13 | 6 | .684 | 4.33 | 25 | 25 | 1 | 1 | 0 | 158.0 | 157 | 76 | 10 | 66 | 94 |
| Ricky Jackson | 2025-2029 | 29 | 28 | .509 | 4.83 | 80 | 79 | 2 | 1 | 0 | 484.2 | 537 | 260 | 47 | 176 | 264 |
| Ed Jacobs | 2023-2024 | 10 | 11 | .476 | 4.45 | 53 | 21 | 0 | 0 | 4 | 190.0 | 209 | 94 | 15 | 96 | 111 |
| Corbin Jameson | 2033-2034 | 2 | 3 | .400 | 5.11 | 17 | 0 | 0 | 0 | 0 | 24.2 | 26 | 14 | 4 | 19 | 19 |
| An Jang-Yop | 2027-2027 | 2 | 3 | .400 | 4.05 | 29 | 0 | 0 | 0 | 13 | 26.2 | 22 | 12 | 1 | 20 | 34 |
| Gerd Jans | 2017-2021 | 11 | 9 | .550 | 6.86 | 118 | 0 | 0 | 0 | 4 | 160.0 | 233 | 122 | 26 | 81 | 142 |
| Maxime Janssens | 2026-2026 | 3 | 1 | .750 | 4.08 | 6 | 6 | 0 | 0 | 0 | 39.2 | 38 | 18 | 1 | 13 | 19 |
| 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 |
| Esteban Jiménez | 2028-2031 | 8 | 5 | .615 | 3.02 | 82 | 0 | 0 | 0 | 49 | 89.1 | 55 | 30 | 5 | 51 | 112 |
| Félix Jiménez | 2028-2029 | 9 | 6 | .600 | 4.60 | 27 | 25 | 0 | 0 | 0 | 139.0 | 146 | 71 | 14 | 68 | 141 |
| Mario Jiménez | 2021-2021 | 0 | 1 | .000 | 21.60 | 8 | 0 | 0 | 0 | 0 | 1.2 | 3 | 4 | 0 | 1 | 1 |
| Miguel Jiménez | 2030-2030 | 0 | 0 | .000 | 5.70 | 17 | 0 | 0 | 0 | 0 | 36.1 | 52 | 23 | 2 | 24 | 14 |
| Ji Jing | 2027-2027 | 3 | 3 | .500 | 3.33 | 7 | 7 | 0 | 0 | 0 | 48.2 | 42 | 18 | 2 | 19 | 38 |
| Ton Jobse | 2030-2031 | 6 | 3 | .667 | 3.87 | 19 | 15 | 0 | 0 | 0 | 88.1 | 77 | 38 | 6 | 51 | 86 |
| 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 | 2024-2026 | 2 | 2 | .500 | 6.75 | 41 | 0 | 0 | 0 | 1 | 26.2 | 37 | 20 | 1 | 18 | 22 |
| Gary Jones | 2019-2025 | 9 | 7 | .562 | 3.94 | 82 | 7 | 1 | 0 | 11 | 164.1 | 186 | 72 | 12 | 59 | 91 |
| 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 |
| Gary Jordan | 2032-2032 | 6 | 10 | .375 | 5.64 | 21 | 21 | 1 | 0 | 0 | 137.1 | 162 | 86 | 14 | 60 | 118 |
| Greg Jordan | 2027-2027 | 0 | 0 | .000 | 1.93 | 3 | 0 | 0 | 0 | 0 | 4.2 | 3 | 1 | 0 | 1 | 6 |
| Gojong Joseon | 2032-2032 | 4 | 7 | .364 | 6.62 | 20 | 14 | 0 | 0 | 1 | 88.1 | 107 | 65 | 15 | 28 | 45 |
| Mimosa Joseph | 2023-2023 | 0 | 1 | .000 | 2.08 | 2 | 2 | 0 | 0 | 0 | 8.2 | 7 | 2 | 0 | 2 | 5 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Jack Joyner | 2034-2034 | 0 | 1 | .000 | 6.28 | 4 | 4 | 0 | 0 | 0 | 14.1 | 10 | 10 | 1 | 15 | 11 |
| José Juárez | 2024-2033 | 11 | 14 | .440 | 4.77 | 56 | 24 | 6 | 1 | 1 | 226.1 | 211 | 120 | 17 | 108 | 176 |
| Fernando Júlio | 2030-2030 | 0 | 0 | .000 | 1.93 | 1 | 0 | 0 | 0 | 0 | 4.2 | 3 | 1 | 1 | 1 | 0 |
