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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 | 2028-2034 | 9 | 12 | .429 | 4.62 | 31 | 31 | 1 | 1 | 0 | 169.1 | 169 | 87 | 9 | 91 | 93 |
| 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 |
| Kenny James | 2039-2040 | 8 | 2 | .800 | 3.20 | 48 | 0 | 0 | 0 | 2 | 112.2 | 90 | 40 | 8 | 58 | 103 |
| Corbin Jameson | 2032-2032 | 1 | 0 | 1.000 | 1.29 | 12 | 0 | 0 | 0 | 3 | 14.0 | 12 | 2 | 0 | 8 | 14 |
| An Jang-Yop | 2026-2036 | 9 | 6 | .600 | 3.45 | 87 | 1 | 0 | 0 | 42 | 101.2 | 78 | 39 | 5 | 67 | 138 |
| Gerd Jans | 2015-2016 | 2 | 6 | .250 | 6.39 | 51 | 7 | 0 | 0 | 7 | 74.2 | 100 | 53 | 17 | 32 | 63 |
| Maxime Janssens | 2028-2030 | 15 | 6 | .714 | 2.67 | 28 | 28 | 0 | 0 | 0 | 175.0 | 167 | 52 | 9 | 47 | 114 |
| Alberto Jaramillo | 2039-2039 | 0 | 0 | .000 | 3.00 | 2 | 0 | 0 | 0 | 0 | 6.0 | 9 | 2 | 0 | 3 | 4 |
| 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 |
| Brenton Jenkins | 2041-2041 | 0 | 0 | .000 | 2.57 | 1 | 1 | 0 | 0 | 0 | 7.0 | 5 | 2 | 1 | 1 | 0 |
| 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 |
| Francisco Jiménez | 2031-2033 | 7 | 7 | .500 | 7.86 | 77 | 10 | 0 | 0 | 0 | 181.0 | 252 | 158 | 25 | 133 | 112 |
| Miguel Jiménez | 2031-2032 | 3 | 2 | .600 | 6.12 | 35 | 0 | 0 | 0 | 0 | 64.2 | 82 | 44 | 4 | 41 | 23 |
| Ton Jobse | 2040-2040 | 1 | 0 | 1.000 | 3.57 | 3 | 3 | 0 | 0 | 0 | 17.2 | 18 | 7 | 1 | 2 | 14 |
| 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 |
| Jacob Johnston | 2036-2037 | 7 | 5 | .583 | 3.99 | 35 | 15 | 0 | 0 | 1 | 90.1 | 93 | 40 | 7 | 43 | 61 |
| Jeffery Johnston | 2041-2041 | 0 | 1 | .000 | 4.56 | 11 | 0 | 0 | 0 | 0 | 25.2 | 33 | 13 | 4 | 11 | 20 |
| Ralph Johnston | 2040-2040 | 1 | 0 | 1.000 | 7.24 | 5 | 1 | 0 | 0 | 0 | 13.2 | 14 | 11 | 0 | 11 | 9 |
| Sam Johnston | 2039-2039 | 1 | 1 | .500 | 6.03 | 16 | 0 | 0 | 0 | 0 | 31.1 | 30 | 21 | 1 | 21 | 30 |
| Jim Johnstone | 2020-2020 | 0 | 0 | .000 | 7.94 | 4 | 0 | 0 | 0 | 0 | 5.2 | 4 | 5 | 0 | 8 | 5 |
| Nate Johnstone | 2034-2034 | 0 | 0 | .000 | 2.08 | 1 | 1 | 0 | 0 | 0 | 4.1 | 4 | 1 | 0 | 4 | 3 |
| Gary Jones | 2016-2023 | 16 | 12 | .571 | 5.20 | 116 | 3 | 0 | 0 | 13 | 180.0 | 222 | 104 | 30 | 58 | 127 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Nate Jones | 2039-2040 | 5 | 2 | .714 | 5.25 | 53 | 0 | 0 | 0 | 0 | 106.1 | 102 | 62 | 13 | 78 | 93 |
| Steven Jones | 2020-2029 | 13 | 20 | .394 | 4.97 | 176 | 2 | 0 | 0 | 8 | 269.2 | 293 | 149 | 26 | 144 | 203 |
| Vaughan Jones | 2039-2039 | 0 | 0 | .000 | 1.69 | 3 | 0 | 0 | 0 | 0 | 5.1 | 4 | 1 | 1 | 0 | 5 |
| Gary Jordan | 2033-2033 | 0 | 0 | .000 | 7.88 | 5 | 0 | 0 | 0 | 0 | 8.0 | 13 | 7 | 2 | 1 | 7 |
| Greg Jordan | 2026-2028 | 1 | 6 | .143 | 5.70 | 35 | 12 | 0 | 0 | 2 | 66.1 | 69 | 42 | 3 | 34 | 42 |
| Gojong Joseon | 2033-2033 | 1 | 2 | .333 | 9.00 | 4 | 4 | 0 | 0 | 0 | 26.0 | 41 | 26 | 7 | 8 | 14 |
| Mimosa Joseph | 2022-2022 | 4 | 6 | .400 | 4.91 | 15 | 15 | 0 | 0 | 0 | 84.1 | 88 | 46 | 4 | 33 | 61 |
| Jose Jovellanos | 2038-2038 | 1 | 0 | 1.000 | 4.60 | 8 | 0 | 0 | 0 | 1 | 15.2 | 15 | 8 | 1 | 5 | 7 |
| Jack Joyner | 2041-2041 | 1 | 0 | 1.000 | 8.78 | 8 | 0 | 0 | 0 | 1 | 13.1 | 22 | 13 | 2 | 5 | 9 |
| José Juárez | 2024-2025 | 0 | 1 | .000 | 3.86 | 11 | 0 | 0 | 0 | 0 | 11.2 | 9 | 5 | 2 | 17 | 6 |
| José Juárez | 2023-2030 | 9 | 10 | .474 | 5.40 | 49 | 28 | 1 | 0 | 3 | 181.2 | 180 | 109 | 14 | 122 | 137 |
| T.J. Juckson | 2040-2040 | 1 | 6 | .143 | 4.33 | 34 | 0 | 0 | 0 | 15 | 35.1 | 27 | 17 | 4 | 18 | 42 |
| Behar Jusufi | 2032-2032 | 3 | 2 | .600 | 5.36 | 11 | 9 | 0 | 0 | 0 | 45.1 | 56 | 27 | 5 | 21 | 37 |
| Markus Jutzi | 2040-2040 | 0 | 6 | .000 | 6.86 | 8 | 8 | 0 | 0 | 0 | 42.0 | 51 | 32 | 2 | 29 | 23 |
