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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 | 2027-2032 | 25 | 34 | .424 | 6.00 | 116 | 63 | 2 | 0 | 1 | 445.1 | 501 | 297 | 46 | 322 | 425 |
| Johnny Jackson | 2030-2030 | 0 | 1 | .000 | 3.86 | 1 | 1 | 0 | 0 | 0 | 7.0 | 8 | 3 | 1 | 1 | 2 |
| Steve Jackson | 2024-2028 | 19 | 26 | .422 | 6.03 | 85 | 62 | 2 | 0 | 2 | 425.2 | 488 | 285 | 86 | 190 | 377 |
| Nari Jaconelli | 2029-2034 | 11 | 6 | .647 | 6.29 | 37 | 11 | 0 | 0 | 0 | 113.0 | 130 | 79 | 14 | 63 | 74 |
| Bruce James | 2022-2026 | 47 | 39 | .547 | 5.38 | 112 | 109 | 7 | 2 | 0 | 741.0 | 879 | 443 | 137 | 169 | 536 |
| Darren James | 2019-2019 | 0 | 1 | .000 | 10.24 | 2 | 2 | 0 | 0 | 0 | 9.2 | 14 | 11 | 2 | 9 | 5 |
| William James | 2019-2019 | 0 | 0 | .000 | 6.75 | 1 | 0 | 0 | 0 | 0 | 1.1 | 2 | 1 | 0 | 1 | 0 |
| José Jáquez | 2036-2040 | 21 | 41 | .339 | 6.03 | 114 | 76 | 2 | 0 | 2 | 472.0 | 530 | 316 | 63 | 273 | 439 |
| John Jarville | 2040-2043 | 34 | 35 | .493 | 5.28 | 85 | 85 | 7 | 1 | 0 | 573.0 | 705 | 336 | 76 | 141 | 278 |
| Ray Jeffery | 2034-2035 | 8 | 8 | .500 | 6.51 | 22 | 22 | 0 | 0 | 0 | 138.1 | 168 | 100 | 28 | 56 | 105 |
| Randy Jeffes | 2030-2030 | 9 | 10 | .474 | 5.19 | 22 | 22 | 3 | 0 | 0 | 154.1 | 190 | 89 | 23 | 52 | 106 |
| Ken Jenkins | 2027-2030 | 2 | 4 | .333 | 5.63 | 53 | 2 | 0 | 0 | 1 | 80.0 | 104 | 50 | 10 | 35 | 64 |
| Kai-ge Jian | 2032-2032 | 0 | 0 | .000 | 0.00 | 5 | 0 | 0 | 0 | 2 | 5.2 | 3 | 0 | 0 | 1 | 1 |
| Derrick Johnson | 2014-2020 | 32 | 22 | .593 | 5.50 | 222 | 0 | 0 | 0 | 33 | 365.0 | 480 | 223 | 39 | 135 | 87 |
| Francis Johnson | 2027-2029 | 9 | 17 | .346 | 5.53 | 52 | 37 | 0 | 0 | 1 | 216.1 | 221 | 133 | 31 | 131 | 174 |
| Glenn Johnson | 2019-2019 | 0 | 0 | .000 | 64.80 | 1 | 0 | 0 | 0 | 0 | 1.2 | 7 | 12 | 1 | 9 | 0 |
| Tristan Johnson | 2019-2022 | 2 | 5 | .286 | 5.54 | 10 | 10 | 0 | 0 | 0 | 65.0 | 66 | 40 | 9 | 33 | 54 |
| Johnny Johnston | 2020-2020 | 0 | 2 | .000 | 5.73 | 6 | 6 | 0 | 0 | 0 | 33.0 | 31 | 21 | 2 | 22 | 29 |
| Brent Johnstone | 2029-2029 | 0 | 1 | .000 | 3.00 | 1 | 0 | 0 | 0 | 0 | 3.0 | 2 | 1 | 1 | 3 | 3 |
| Glen Jones | 2035-2036 | 5 | 4 | .556 | 4.75 | 61 | 0 | 0 | 0 | 2 | 100.1 | 111 | 53 | 10 | 36 | 71 |
| Jeremy Jones | 2016-2019 | 27 | 23 | .540 | 5.25 | 68 | 68 | 3 | 1 | 0 | 415.0 | 467 | 242 | 51 | 152 | 247 |
| Michael Jones | 2014-2020 | 8 | 17 | .320 | 5.43 | 137 | 0 | 0 | 0 | 23 | 207.1 | 247 | 125 | 27 | 81 | 85 |
| Neil Jones | 2015-2016 | 2 | 11 | .154 | 8.01 | 36 | 17 | 1 | 0 | 2 | 123.2 | 179 | 110 | 24 | 70 | 77 |
| Ron Jones | 2019-2019 | 4 | 2 | .667 | 5.53 | 10 | 5 | 0 | 0 | 0 | 42.1 | 48 | 26 | 9 | 6 | 39 |
| William Jones | 2030-2038 | 24 | 14 | .632 | 5.03 | 130 | 42 | 3 | 1 | 4 | 415.1 | 449 | 232 | 19 | 293 | 278 |
| Patrick Jordan | 2029-2030 | 6 | 3 | .667 | 5.28 | 58 | 7 | 0 | 0 | 3 | 134.2 | 145 | 79 | 14 | 73 | 67 |
| Jeremy Joseph | 2020-2020 | 0 | 1 | .000 | 4.73 | 12 | 0 | 0 | 0 | 2 | 13.1 | 19 | 7 | 2 | 9 | 14 |
| Kiminobu Jouda | 2026-2027 | 6 | 5 | .545 | 5.92 | 33 | 8 | 0 | 0 | 2 | 76.0 | 86 | 50 | 11 | 45 | 61 |
| Doug Joyce | 2037-2040 | 24 | 30 | .444 | 5.26 | 91 | 79 | 0 | 0 | 6 | 465.0 | 537 | 272 | 57 | 190 | 399 |
| Vicente Juárez | 2018-2019 | 6 | 6 | .500 | 6.66 | 96 | 0 | 0 | 0 | 16 | 131.0 | 157 | 97 | 15 | 64 | 71 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
