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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prince Michael Jackson | 2029-2033 | 22 | 38 | .367 | 3.66 | 101 | 100 | 1 | 1 | 0 | 545.2 | 494 | 222 | 55 | 178 | 418 |
| Justin Jamerson | 2015-2015 | 2 | 0 | 1.000 | 2.45 | 4 | 0 | 0 | 0 | 0 | 7.1 | 5 | 2 | 0 | 3 | 6 |
| Corbin Jameson | 2032-2032 | 1 | 1 | .500 | 8.10 | 3 | 0 | 0 | 0 | 0 | 6.2 | 8 | 6 | 1 | 3 | 5 |
| An Jang-Yop | 2029-2032 | 13 | 7 | .650 | 2.61 | 94 | 0 | 0 | 0 | 43 | 113.2 | 87 | 33 | 11 | 63 | 169 |
| Gerd Jans | 2015-2015 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 3.0 | 3 | 0 | 0 | 4 | 2 |
| Maxime Janssens | 2029-2030 | 9 | 9 | .500 | 3.56 | 34 | 34 | 2 | 0 | 0 | 210.0 | 206 | 83 | 11 | 56 | 148 |
| Augusto Jaramillo | 2016-2019 | 12 | 10 | .545 | 2.74 | 162 | 0 | 0 | 0 | 43 | 164.1 | 129 | 50 | 13 | 66 | 140 |
| Bill Jensen | 2019-2021 | 2 | 3 | .400 | 4.91 | 35 | 0 | 0 | 0 | 1 | 29.1 | 34 | 16 | 5 | 18 | 22 |
| Félix Jiménez | 2022-2026 | 38 | 31 | .551 | 4.41 | 109 | 102 | 3 | 1 | 0 | 638.2 | 565 | 313 | 68 | 377 | 735 |
| Ji Jing | 2030-2033 | 5 | 7 | .417 | 3.66 | 33 | 16 | 0 | 0 | 1 | 140.1 | 138 | 57 | 9 | 52 | 60 |
| Franklin Johnson | 2015-2016 | 0 | 1 | .000 | 13.50 | 16 | 0 | 0 | 0 | 0 | 12.0 | 19 | 18 | 3 | 20 | 3 |
| Joe Johnson | 2015-2021 | 7 | 13 | .350 | 4.64 | 56 | 17 | 1 | 0 | 0 | 165.0 | 164 | 85 | 11 | 98 | 67 |
| Myron Johnson | 2015-2018 | 25 | 16 | .610 | 3.32 | 51 | 51 | 5 | 1 | 0 | 344.0 | 324 | 127 | 28 | 167 | 318 |
| William Johnson | 2016-2016 | 14 | 2 | .875 | 1.92 | 20 | 20 | 4 | 2 | 0 | 159.2 | 112 | 34 | 12 | 34 | 156 |
| Denver Johnston | 2017-2020 | 9 | 2 | .818 | 3.59 | 91 | 0 | 0 | 0 | 0 | 92.2 | 81 | 37 | 9 | 43 | 90 |
| Walt Johnston | 2015-2021 | 22 | 14 | .611 | 3.39 | 47 | 44 | 11 | 6 | 0 | 305.0 | 285 | 115 | 14 | 113 | 194 |
| Barry Jones | 2024-2027 | 8 | 6 | .571 | 3.68 | 94 | 0 | 0 | 0 | 4 | 134.2 | 117 | 55 | 17 | 64 | 132 |
| Gary Jones | 2015-2020 | 8 | 15 | .348 | 5.45 | 117 | 13 | 0 | 0 | 4 | 191.2 | 234 | 116 | 19 | 92 | 90 |
| Harrison Jones | 2017-2021 | 33 | 14 | .702 | 2.62 | 60 | 60 | 13 | 4 | 0 | 435.2 | 358 | 127 | 28 | 121 | 340 |
| Mike Jones | 2016-2020 | 30 | 28 | .517 | 4.48 | 82 | 71 | 4 | 2 | 1 | 445.2 | 471 | 222 | 39 | 218 | 309 |
| Ralph Jones | 2015-2017 | 7 | 5 | .583 | 2.48 | 22 | 18 | 0 | 0 | 1 | 112.2 | 102 | 31 | 3 | 39 | 75 |
| Greg Jordan | 2020-2026 | 14 | 4 | .778 | 2.78 | 120 | 0 | 0 | 0 | 24 | 113.1 | 72 | 35 | 8 | 77 | 98 |
| Gojong Joseon | 2033-2034 | 8 | 4 | .667 | 2.07 | 46 | 1 | 0 | 0 | 19 | 61.0 | 54 | 14 | 6 | 17 | 67 |
| Johnny Joyce | 2015-2019 | 33 | 25 | .569 | 3.17 | 133 | 89 | 1 | 1 | 2 | 573.1 | 534 | 202 | 45 | 181 | 447 |
| Juan Júlio | 2015-2026 | 0 | 4 | .000 | 4.11 | 33 | 8 | 0 | 0 | 1 | 76.2 | 72 | 35 | 8 | 29 | 52 |
