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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 |
|---|---|---|---|---|---|---|---|---|---|
| Justin Jackson | 2041-2041 | .000 | 0 | 0 | 0 | 0 | 0 | 9.30 | 18 |
| Mike Jackson | 2026-2026 | .154 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Jacob | 2018-2018 | .185 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Jacob | 2018-2018 | .246 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Jacobs | 2041-2041 | .000 | 0 | 0 | 0 | 0 | 0 | 10.80 | 1 |
| Matt Jacobson | 2032-2032 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Tom Jacoby | 2021-2027 | .000 | 0 | 0 | 15 | 12 | 8 | 4.20 | 267 |
| Ramon Jacquez | 2033-2041 | .000 | 0 | 0 | 60 | 52 | 2 | 3.66 | 929 |
| Jason Jahn | 2028-2041 | .281 | 221 | 838 | 0 | 0 | 0 | 0.00 | 0 |
| Ted Jahn | 2029-2041 | .213 | 12 | 243 | 0 | 0 | 0 | 0.00 | 0 |
| Rich James | 2018-2025 | .297 | 28 | 202 | 0 | 0 | 0 | 0.00 | 0 |
| Scott James | 2018-2019 | .253 | 42 | 130 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Janes | 2028-2028 | .224 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Joey Janofsky | 2035-2036 | .000 | 0 | 0 | 1 | 1 | 0 | 4.38 | 18 |
| Mario Jaramillo | 2033-2041 | .000 | 0 | 0 | 33 | 59 | 326 | 2.88 | 899 |
| Oscar Jaramillo | 2031-2041 | .241 | 94 | 458 | 0 | 0 | 0 | 0.00 | 0 |
| Cody Jarman | 2033-2040 | .215 | 247 | 634 | 0 | 0 | 0 | 0.00 | 0 |
| Henry Jauregui | 2033-2041 | .000 | 0 | 0 | 25 | 29 | 25 | 3.68 | 488 |
| Doug Jenkins | 2018-2025 | .000 | 0 | 0 | 34 | 28 | 152 | 2.47 | 813 |
| Kenny Jennings | 2023-2026 | .000 | 0 | 0 | 6 | 17 | 5 | 6.62 | 261 |
| Simone Jennings | 2019-2020 | .000 | 0 | 0 | 3 | 0 | 0 | 4.57 | 67 |
| Alex Jensen | 2021-2030 | .000 | 0 | 0 | 31 | 36 | 38 | 4.34 | 470 |
| Joel Jensen | 2018-2024 | .293 | 60 | 395 | 0 | 0 | 0 | 0.00 | 0 |
| Jun-ho Jeon | 2018-2026 | .288 | 51 | 416 | 0 | 0 | 0 | 0.00 | 1 |
| Rob Jerrell | 2024-2027 | .196 | 7 | 42 | 0 | 0 | 0 | 13.50 | 0 |
| Chad Jimenes | 2024-2024 | .000 | 0 | 0 | 6 | 3 | 2 | 4.04 | 99 |
| Alex Jimenez | 2039-2040 | .000 | 0 | 0 | 3 | 3 | 0 | 4.25 | 67 |
| Carlos Jimenez | 2040-2041 | .305 | 43 | 164 | 0 | 0 | 0 | 0.00 | 0 |
| Carlos Jimenez | 2019-2021 | .238 | 5 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Sergio Jimenez | 2037-2038 | .000 | 0 | 0 | 0 | 2 | 0 | 1.25 | 48 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Bobby Johnson | 2031-2040 | .000 | 0 | 0 | 27 | 20 | 12 | 3.03 | 762 |
| Chad Johnson | 2040-2041 | .214 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Jabari Johnson | 2036-2041 | .287 | 9 | 157 | 0 | 0 | 0 | 0.00 | 0 |
| Jaden Johnson | 2028-2029 | .304 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Jeff Johnson | 2018-2028 | .000 | 0 | 0 | 133 | 103 | 0 | 3.84 | 1673 |
| Mike Johnson | 2033-2041 | .000 | 0 | 0 | 12 | 8 | 2 | 3.14 | 239 |
| Russ Johnson | 2024-2030 | .215 | 27 | 101 | 0 | 0 | 0 | 0.00 | 0 |
| Fred Jones | 2019-2021 | .000 | 0 | 0 | 1 | 3 | 0 | 5.73 | 23 |
| Jaime Jones | 2030-2034 | .193 | 13 | 61 | 0 | 0 | 0 | 0.00 | 0 |
| Joel Jones | 2033-2041 | .000 | 0 | 0 | 43 | 73 | 0 | 5.09 | 876 |
| Mike Jones | 2037-2037 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Vince Jones | 2031-2031 | .000 | 0 | 0 | 0 | 0 | 0 | 4.02 | 19 |
| Billy Jordan | 2039-2041 | .316 | 4 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Mark Jory | 2025-2033 | .000 | 0 | 0 | 28 | 29 | 0 | 4.78 | 508 |
| Brad Josi | 2036-2036 | .246 | 1 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Wayne Joy | 2038-2038 | .122 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Frank Juan | 2030-2040 | .000 | 0 | 0 | 17 | 11 | 6 | 3.48 | 320 |
| Danny Juarez | 2041-2041 | .238 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Josh Judge | 2023-2031 | .215 | 14 | 117 | 0 | 0 | 0 | 0.00 | 0 |
| Dong-hyun Jung | 2018-2028 | .276 | 189 | 775 | 0 | 0 | 0 | 0.00 | 0 |
