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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
|---|---|---|---|---|---|---|---|---|---|
| Frank Jackson | 2033-2038 | .000 | 0 | 0 | 19 | 24 | 38 | 5.53 | 336 |
| Gordon Jackson | 2034-2039 | .260 | 38 | 148 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Jackson | 2029-2030 | .000 | 0 | 0 | 1 | 1 | 0 | 5.24 | 23 |
| Will Jackson | 2027-2029 | .259 | 61 | 188 | 0 | 0 | 0 | 0.00 | 0 |
| Chris Jacobs | 2041-2042 | .249 | 9 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Ayub Jamal | 2032-2038 | .000 | 0 | 0 | 35 | 39 | 1 | 4.91 | 461 |
| Bruce James | 2027-2028 | .000 | 0 | 0 | 18 | 16 | 0 | 5.25 | 164 |
| Darren James | 2020-2026 | .119 | 0 | 4 | 14 | 29 | 9 | 5.51 | 280 |
| Jim James | 2030-2033 | .400 | 0 | 0 | 2 | 2 | 2 | 4.52 | 81 |
| John James | 2014-2015 | .000 | 0 | 0 | 3 | 8 | 0 | 10.01 | 40 |
| Lance Janzen | 2040-2041 | .164 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jesús Jaramillo | 2022-2025 | .297 | 47 | 154 | 0 | 0 | 0 | 0.00 | 0 |
| John Jarville | 2034-2039 | .162 | 0 | 24 | 55 | 35 | 2 | 4.82 | 490 |
| Ray Jeffery | 2033-2038 | .220 | 1 | 8 | 45 | 51 | 8 | 5.44 | 609 |
| Randy Jeffes | 2031-2031 | .000 | 0 | 0 | 6 | 3 | 1 | 5.14 | 40 |
| Ken Jenkins | 2029-2030 | .000 | 0 | 0 | 3 | 4 | 1 | 5.28 | 59 |
| Kevin Jensen | 2022-2028 | .226 | 89 | 274 | 0 | 0 | 0 | 0.00 | 0 |
| Kai-ge Jian | 2029-2032 | .000 | 0 | 0 | 9 | 5 | 6 | 4.17 | 123 |
| Gilberto Jiménez | 2036-2037 | .000 | 0 | 0 | 2 | 1 | 1 | 7.30 | 33 |
| José Jiménez | 2014-2017 | .000 | 0 | 0 | 46 | 28 | 3 | 4.44 | 432 |
| Raúl Jiménez | 2022-2026 | .263 | 46 | 184 | 0 | 0 | 0 | 0.00 | 0 |
| Salvador Jiménez | 2033-2033 | .284 | 10 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Maxim Jochems | 2042-2043 | .259 | 6 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Bill Johnson | 2016-2016 | .000 | 0 | 0 | 2 | 4 | 5 | 8.50 | 29 |
| Darrell Johnson | 2022-2026 | .253 | 98 | 378 | 0 | 0 | 0 | 0.00 | 0 |
| Francis Johnson | 2031-2033 | .133 | 0 | 3 | 10 | 16 | 6 | 5.49 | 243 |
| Hollis Johnson | 2028-2028 | .336 | 33 | 88 | 0 | 0 | 0 | 0.00 | 0 |
| Irwin Johnson | 2026-2028 | .263 | 25 | 92 | 0 | 0 | 0 | 0.00 | 0 |
| Jordan Johnson | 2026-2028 | .000 | 0 | 0 | 10 | 27 | 0 | 6.10 | 202 |
| Roy Johnson | 2041-2043 | .182 | 0 | 5 | 20 | 19 | 6 | 4.80 | 209 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tristan Johnson | 2021-2021 | .000 | 0 | 0 | 2 | 1 | 0 | 7.22 | 53 |
| Johnny Johnston | 2021-2022 | .000 | 0 | 0 | 3 | 2 | 1 | 6.98 | 51 |
| Freddie Jonas | 2016-2016 | .000 | 0 | 0 | 4 | 4 | 0 | 6.11 | 40 |
| Conrad Jones | 2036-2038 | .280 | 35 | 156 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Jones | 2024-2026 | .242 | 34 | 154 | 0 | 0 | 0 | 0.00 | 0 |
| Erwin Jones | 2014-2018 | .292 | 83 | 309 | 0 | 0 | 0 | 0.00 | 0 |
| Fraser Jones | 2030-2033 | .294 | 17 | 84 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry Jones | 2030-2035 | .275 | 24 | 107 | 0 | 0 | 0 | 0.00 | 0 |
| Keith Jones | 2027-2029 | .286 | 15 | 109 | 0 | 0 | 0 | 0.00 | 0 |
| Kip Jones | 2036-2041 | .294 | 54 | 210 | 0 | 0 | 0 | 0.00 | 0 |
| Lucas Jones | 2025-2028 | .274 | 31 | 151 | 0 | 0 | 0 | 0.00 | 0 |
| Michael Jones | 2016-2018 | .050 | 0 | 1 | 9 | 13 | 28 | 3.87 | 113 |
| Shawn Jones | 2041-2043 | .261 | 68 | 231 | 0 | 0 | 0 | 0.00 | 0 |
| Petro Joosten | 2023-2024 | .331 | 1 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| Jamal Jordan | 2023-2025 | .045 | 0 | 0 | 20 | 15 | 48 | 5.03 | 157 |
| John Jordan | 2040-2043 | .232 | 0 | 5 | 25 | 27 | 0 | 5.06 | 324 |
| Mark Jordan | 2031-2034 | .262 | 70 | 263 | 0 | 0 | 0 | 0.00 | 0 |
| Peter Joseph | 2028-2030 | .305 | 26 | 120 | 0 | 0 | 0 | 0.00 | 0 |
| Kiminobu Jouda | 2025-2025 | .000 | 0 | 0 | 1 | 3 | 2 | 4.73 | 25 |
| Ryutaro Jouda | 2014-2017 | .000 | 0 | 0 | 38 | 26 | 0 | 5.05 | 278 |
| Takuji Jouon | 2019-2022 | .000 | 0 | 0 | 16 | 15 | 0 | 4.56 | 263 |
| Melvin Joyce | 2021-2023 | .287 | 8 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Ángel Juárez | 2026-2026 | .318 | 3 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Aaron Justin | 2019-2019 | .206 | 4 | 13 | 0 | 0 | 0 | 0.00 | 0 |
