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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 |
|---|---|---|---|---|---|---|---|---|---|
| Cory Jackson | 2037-2037 | .000 | 0 | 0 | 0 | 0 | 0 | 1.86 | 7 |
| Kent Jackson | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Jackson | 2035-2036 | .000 | 0 | 0 | 3 | 2 | 2 | 2.39 | 62 |
| Mark Jacobson | 2035-2037 | .000 | 0 | 0 | 13 | 10 | 28 | 2.59 | 180 |
| Mario Jacome | 2026-2028 | .241 | 6 | 66 | 0 | 0 | 0 | 0.00 | 0 |
| Ryung Jae-Wook | 2036-2036 | .286 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Milos Jaksch | 2031-2031 | .341 | 4 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Howard Jamerson | 2027-2030 | .000 | 0 | 0 | 7 | 15 | 0 | 3.87 | 253 |
| Gil James | 2038-2038 | .207 | 0 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Kent James | 2037-2038 | .182 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Mike James | 2033-2033 | .241 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Corbin Jameson | 2024-2025 | .000 | 0 | 0 | 8 | 8 | 13 | 3.15 | 158 |
| An Jang-Yop | 2022-2022 | .000 | 0 | 0 | 2 | 4 | 1 | 3.23 | 42 |
| John Jankila | 2035-2038 | .230 | 13 | 105 | 0 | 0 | 0 | 0.00 | 0 |
| Job Janssen | 2037-2037 | .000 | 0 | 0 | 6 | 4 | 9 | 1.82 | 66 |
| Stuart Janssen | 2030-2035 | .224 | 3 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Maxime Janssens | 2025-2025 | .000 | 0 | 0 | 6 | 4 | 0 | 2.30 | 48 |
| Branlyn Jaraba | 2033-2033 | .000 | 0 | 0 | 3 | 4 | 9 | 2.28 | 29 |
| José Jarca | 2024-2024 | .228 | 6 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Guomez Jardim | 2026-2026 | .000 | 0 | 0 | 1 | 0 | 0 | 1.17 | 5 |
| Atro Jarvilehto | 2032-2032 | .417 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Gary Jenkins | 2033-2033 | .214 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Rickey Jenkins | 2038-2038 | .171 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| Marty Jennings | 2020-2020 | .296 | 0 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Jensson | 2035-2035 | .154 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Matt Jeong | 2027-2029 | .204 | 14 | 91 | 0 | 0 | 0 | 0.00 | 0 |
| Yong-ho Jheon | 2037-2038 | .254 | 10 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| César Jiménez | 2037-2038 | .154 | 1 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Dallas Jiménez | 2033-2034 | .208 | 18 | 70 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Jiménez | 2024-2024 | .000 | 0 | 0 | 3 | 6 | 0 | 3.43 | 62 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| José Jiménez | 2037-2037 | .220 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Ji Jing | 2025-2025 | .000 | 0 | 0 | 4 | 3 | 0 | 2.06 | 84 |
| Sisay Jitu | 2028-2029 | .219 | 2 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Ton Jobse | 2028-2028 | .000 | 0 | 0 | 6 | 5 | 0 | 3.12 | 136 |
| Terry John | 2031-2032 | .255 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Keith Johnson | 2032-2032 | .000 | 0 | 0 | 1 | 2 | 12 | 3.43 | 25 |
| Kelly Johnson | 2038-2038 | .333 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Johnson | 2023-2023 | .281 | 2 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Samual Johnson | 2038-2038 | .175 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Curt Johnston | 2021-2022 | .242 | 4 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Gerald Johnston | 2038-2038 | .185 | 3 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Jacob Johnston | 2033-2033 | .000 | 0 | 0 | 2 | 1 | 0 | 3.30 | 26 |
| Jeffery Johnston | 2036-2037 | .000 | 0 | 0 | 6 | 10 | 15 | 6.43 | 57 |
| Larry Johnston | 2020-2020 | .280 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Johnston | 2021-2021 | .287 | 2 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| George Johnstone | 2036-2036 | .000 | 0 | 0 | 4 | 3 | 0 | 3.01 | 51 |
| Derek Jones | 2033-2033 | .000 | 0 | 0 | 7 | 11 | 0 | 6.36 | 74 |
| Harrison Jones | 2020-2020 | .269 | 1 | 32 | 0 | 0 | 0 | 0.00 | 0 |
| Johnny Jones | 2038-2038 | .171 | 5 | 29 | 0 | 0 | 0 | 0.00 | 0 |
| Leon Jones | 2022-2022 | .000 | 0 | 0 | 1 | 2 | 0 | 4.68 | 14 |
| Michael Jones | 2038-2038 | .184 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Obi Jones | 2029-2029 | .194 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Jones | 2021-2021 | .295 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Steffen Jones | 2035-2035 | .176 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Jones | 2032-2033 | .000 | 0 | 0 | 0 | 2 | 0 | 6.95 | 13 |
| Steve Jones | 2021-2022 | .188 | 3 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Brian Joo | 2034-2035 | .000 | 0 | 0 | 9 | 9 | 0 | 4.74 | 122 |
| Jing-sheng Joo | 2024-2026 | .221 | 3 | 60 | 0 | 0 | 0 | 0.00 | 0 |
| Gary Jordan | 2029-2029 | .000 | 0 | 0 | 1 | 0 | 0 | 2.61 | 25 |
| Jasper Jordan | 2034-2034 | .000 | 0 | 0 | 6 | 2 | 17 | 2.74 | 88 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tim Jordan | 2033-2035 | .224 | 36 | 145 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Josafat | 2036-2036 | .000 | 0 | 0 | 1 | 4 | 0 | 6.20 | 38 |
| Ricco Jovine | 2024-2025 | .194 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Tomislav Jovovich | 2034-2037 | .347 | 11 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Arlen Joysey | 2023-2023 | .313 | 4 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| John Juanda | 2038-2038 | .207 | 3 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| José Juárez | 2020-2021 | .000 | 0 | 0 | 5 | 8 | 11 | 3.52 | 95 |
| Norberto Juárez | 2027-2027 | .125 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Mariano Juderías | 2038-2038 | .275 | 5 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Juderías | 2035-2035 | .265 | 0 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Justice | 2028-2029 | .208 | 1 | 35 | 0 | 0 | 0 | 0.00 | 0 |
| Tony Justice | 2022-2022 | .419 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
