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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 | 2033-2049 | 112 | 105 | .516 | 3.79 | 515 | 259 | 26 | 7 | 4 | 1974.1 | 1979 | 831 | 225 | 384 | 1947 |
| Lukyan Jakushin | 2044-2044 | 2 | 2 | .500 | 5.84 | 7 | 0 | 0 | 0 | 0 | 12.1 | 14 | 8 | 2 | 4 | 15 |
| Joey Janofsky | 2035-2036 | 1 | 1 | .500 | 4.38 | 16 | 0 | 0 | 0 | 0 | 24.2 | 18 | 12 | 4 | 13 | 18 |
| Mario Jaramillo | 2033-2047 | 47 | 83 | .362 | 3.13 | 864 | 0 | 0 | 0 | 438 | 979.2 | 866 | 341 | 81 | 270 | 1253 |
| Henry Jauregui | 2033-2043 | 32 | 44 | .421 | 3.55 | 376 | 22 | 0 | 0 | 51 | 611.1 | 594 | 241 | 56 | 202 | 646 |
| 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 | 2037-2045 | 1 | 2 | .333 | 3.72 | 37 | 0 | 0 | 0 | 0 | 67.2 | 68 | 28 | 0 | 31 | 75 |
| Bobby Johnson | 2031-2040 | 27 | 20 | .574 | 3.03 | 301 | 0 | 0 | 0 | 12 | 504.2 | 394 | 170 | 52 | 137 | 762 |
| Gray Johnson | 2046-2047 | 0 | 0 | .000 | 5.28 | 9 | 0 | 0 | 0 | 0 | 15.1 | 15 | 9 | 4 | 11 | 12 |
| Jeff Johnson | 2018-2028 | 133 | 103 | .564 | 3.84 | 341 | 333 | 24 | 6 | 0 | 2186.0 | 2337 | 932 | 249 | 350 | 1673 |
| Mike Johnson | 2033-2045 | 19 | 15 | .559 | 3.03 | 290 | 0 | 0 | 0 | 4 | 341.1 | 296 | 115 | 28 | 117 | 472 |
| Omari Johnson | 2046-2049 | 7 | 12 | .368 | 4.98 | 101 | 0 | 0 | 0 | 3 | 161.0 | 160 | 89 | 17 | 96 | 150 |
| T.J. Johnson | 2045-2045 | 0 | 0 | .000 | 43.20 | 2 | 0 | 0 | 0 | 0 | 1.2 | 8 | 8 | 1 | 2 | 2 |
| 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 | 2030-2044 | 19 | 13 | .594 | 3.50 | 267 | 2 | 0 | 0 | 7 | 424.2 | 427 | 165 | 23 | 105 | 373 |
