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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Justin Jackson | 2041-2041 | 0 | 0 | .000 | 9.30 | 18 | 0 | 0 | 0 | 0 | 20.1 | 31 | 21 | 4 | 14 | 18 |
| Josh Jacobs | 2041-2041 | 0 | 0 | .000 | 10.80 | 3 | 0 | 0 | 0 | 0 | 1.2 | 2 | 2 | 1 | 0 | 1 |
| Tom Jacoby | 2021-2027 | 15 | 12 | .556 | 4.20 | 266 | 0 | 0 | 0 | 8 | 287.0 | 294 | 134 | 25 | 152 | 267 |
| Ramon Jacquez | 2033-2041 | 60 | 52 | .536 | 3.66 | 218 | 133 | 21 | 5 | 2 | 970.0 | 981 | 395 | 98 | 146 | 929 |
| Joey Janofsky | 2035-2036 | 1 | 1 | .500 | 4.38 | 16 | 0 | 0 | 0 | 0 | 24.2 | 18 | 12 | 4 | 13 | 18 |
| Mario Jaramillo | 2033-2041 | 33 | 59 | .359 | 2.88 | 609 | 0 | 0 | 0 | 326 | 678.0 | 563 | 217 | 44 | 173 | 899 |
| Henry Jauregui | 2033-2041 | 25 | 29 | .463 | 3.68 | 268 | 22 | 0 | 0 | 25 | 474.1 | 469 | 194 | 41 | 155 | 488 |
| Doug Jenkins | 2018-2025 | 34 | 28 | .548 | 2.47 | 534 | 26 | 0 | 0 | 152 | 664.1 | 510 | 182 | 53 | 180 | 813 |
| Kenny Jennings | 2023-2026 | 6 | 17 | .261 | 6.62 | 240 | 1 | 0 | 0 | 5 | 292.1 | 367 | 215 | 54 | 123 | 261 |
| Simone Jennings | 2019-2020 | 3 | 0 | 1.000 | 4.57 | 66 | 0 | 0 | 0 | 0 | 86.2 | 83 | 44 | 11 | 43 | 67 |
| Alex Jensen | 2021-2030 | 31 | 36 | .463 | 4.34 | 518 | 0 | 0 | 0 | 38 | 518.1 | 562 | 250 | 59 | 137 | 470 |
| Joel Jensen | 2018-2024 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.1 | 2 | 0 | 0 | 0 | 0 |
| Jun-ho Jeon | 2018-2026 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 2 | 0 | 0 | 1 | 1 |
| Rob Jerrell | 2024-2027 | 0 | 0 | .000 | 13.50 | 1 | 0 | 0 | 0 | 0 | 0.2 | 2 | 1 | 0 | 1 | 0 |
| Chad Jimenes | 2024-2024 | 6 | 3 | .667 | 4.04 | 43 | 9 | 0 | 0 | 2 | 113.2 | 108 | 51 | 17 | 27 | 99 |
| Alex Jimenez | 2039-2040 | 3 | 3 | .500 | 4.25 | 57 | 0 | 0 | 0 | 0 | 65.2 | 66 | 31 | 7 | 28 | 67 |
| Sergio Jimenez | 2037-2038 | 0 | 2 | .000 | 1.25 | 22 | 0 | 0 | 0 | 0 | 43.1 | 35 | 6 | 0 | 9 | 48 |
| Bobby Johnson | 2031-2040 | 27 | 20 | .574 | 3.03 | 301 | 0 | 0 | 0 | 12 | 504.2 | 394 | 170 | 52 | 137 | 762 |
| Jeff Johnson | 2018-2028 | 133 | 103 | .564 | 3.84 | 341 | 333 | 24 | 6 | 0 | 2186.0 | 2337 | 932 | 249 | 350 | 1673 |
| Mike Johnson | 2033-2041 | 12 | 8 | .600 | 3.14 | 155 | 0 | 0 | 0 | 2 | 175.0 | 150 | 61 | 12 | 58 | 239 |
| Fred Jones | 2019-2021 | 1 | 3 | .250 | 5.73 | 14 | 5 | 0 | 0 | 0 | 37.2 | 52 | 24 | 2 | 20 | 23 |
| Joel Jones | 2033-2041 | 43 | 73 | .371 | 5.09 | 154 | 150 | 20 | 4 | 0 | 965.2 | 1180 | 546 | 127 | 123 | 876 |
| Vince Jones | 2031-2031 | 0 | 0 | .000 | 4.02 | 9 | 0 | 0 | 0 | 0 | 15.2 | 19 | 7 | 0 | 5 | 19 |
| Mark Jory | 2025-2033 | 28 | 29 | .491 | 4.78 | 138 | 67 | 3 | 1 | 0 | 514.0 | 593 | 273 | 93 | 130 | 508 |
| Frank Juan | 2030-2040 | 17 | 11 | .607 | 3.48 | 237 | 1 | 0 | 0 | 6 | 372.2 | 365 | 144 | 21 | 94 | 320 |
