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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 | 0 | 1.000 | 1.46 | 8 | 0 | 0 | 0 | 1 | 12.1 | 9 | 2 | 0 | 3 | 12 |
| Jason Jackson | 2019-2022 | 13 | 39 | .250 | 6.82 | 76 | 67 | 2 | 0 | 0 | 336.1 | 443 | 255 | 35 | 193 | 197 |
| Leroy Jackson | 2016-2018 | 4 | 4 | .500 | 7.02 | 22 | 15 | 0 | 0 | 0 | 75.2 | 109 | 59 | 11 | 34 | 77 |
| Prince Michael Jackson | 2028-2029 | 8 | 12 | .400 | 4.81 | 28 | 28 | 1 | 1 | 0 | 157.1 | 158 | 84 | 8 | 85 | 85 |
| Ed Jacobs | 2019-2025 | 14 | 19 | .424 | 5.74 | 77 | 48 | 2 | 1 | 12 | 282.1 | 325 | 180 | 24 | 144 | 199 |
| Justin Jamerson | 2015-2015 | 0 | 0 | .000 | 5.00 | 7 | 0 | 0 | 0 | 0 | 9.0 | 14 | 5 | 2 | 2 | 11 |
| An Jang-Yop | 2026-2028 | 8 | 6 | .571 | 3.71 | 86 | 0 | 0 | 0 | 42 | 94.2 | 74 | 39 | 5 | 66 | 133 |
| Gerd Jans | 2015-2016 | 2 | 6 | .250 | 6.39 | 51 | 7 | 0 | 0 | 7 | 74.2 | 100 | 53 | 17 | 32 | 63 |
| Maxime Janssens | 2028-2028 | 14 | 5 | .737 | 2.66 | 25 | 25 | 0 | 0 | 0 | 159.0 | 152 | 47 | 9 | 41 | 101 |
| Augusto Jaramillo | 2020-2020 | 0 | 1 | .000 | 2.70 | 12 | 0 | 0 | 0 | 0 | 10.0 | 9 | 3 | 1 | 5 | 10 |
| Raúl Javier | 2015-2015 | 3 | 0 | 1.000 | 6.29 | 22 | 0 | 0 | 0 | 0 | 44.1 | 53 | 31 | 9 | 14 | 28 |
| Rudy Jenkins | 2018-2018 | 1 | 16 | .059 | 7.09 | 25 | 25 | 0 | 0 | 0 | 120.2 | 184 | 95 | 23 | 67 | 101 |
| Bill Jensen | 2013-2016 | 1 | 0 | 1.000 | 7.50 | 24 | 3 | 0 | 0 | 0 | 42.0 | 62 | 35 | 8 | 22 | 24 |
| Esteban Jiménez | 2027-2027 | 0 | 1 | .000 | 3.60 | 12 | 0 | 0 | 0 | 7 | 15.0 | 12 | 6 | 1 | 10 | 17 |
| Joe Johnson | 2016-2016 | 2 | 2 | .500 | 4.91 | 39 | 0 | 0 | 0 | 0 | 51.1 | 67 | 28 | 7 | 28 | 39 |
| Denver Johnston | 2017-2021 | 2 | 1 | .667 | 6.27 | 18 | 0 | 0 | 0 | 1 | 18.2 | 21 | 13 | 2 | 12 | 16 |
| Jim Johnstone | 2020-2020 | 0 | 0 | .000 | 7.94 | 4 | 0 | 0 | 0 | 0 | 5.2 | 4 | 5 | 0 | 8 | 5 |
| Gary Jones | 2016-2023 | 16 | 12 | .571 | 5.20 | 116 | 3 | 0 | 0 | 13 | 180.0 | 222 | 104 | 30 | 58 | 127 |
| Steven Jones | 2020-2029 | 13 | 20 | .394 | 4.97 | 176 | 2 | 0 | 0 | 8 | 269.2 | 293 | 149 | 26 | 144 | 203 |
| Greg Jordan | 2026-2028 | 1 | 6 | .143 | 5.70 | 35 | 12 | 0 | 0 | 2 | 66.1 | 69 | 42 | 3 | 34 | 42 |
| Mimosa Joseph | 2022-2022 | 4 | 6 | .400 | 4.91 | 15 | 15 | 0 | 0 | 0 | 84.1 | 88 | 46 | 4 | 33 | 61 |
| José Juárez | 2024-2025 | 0 | 1 | .000 | 3.86 | 11 | 0 | 0 | 0 | 0 | 11.2 | 9 | 5 | 2 | 17 | 6 |
| José Juárez | 2023-2023 | 2 | 3 | .400 | 6.35 | 29 | 12 | 0 | 0 | 3 | 68.0 | 70 | 48 | 6 | 50 | 46 |
