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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 |
|---|---|---|---|---|---|---|---|---|---|
| John Jackson | 2039-2039 | .285 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Jackson | 2031-2032 | .000 | 0 | 0 | 21 | 11 | 0 | 2.66 | 309 |
| Abraham Jacobs | 2020-2021 | .247 | 12 | 50 | 0 | 0 | 0 | 0.00 | 0 |
| Jessie James | 2039-2039 | .000 | 0 | 0 | 1 | 0 | 1 | 6.32 | 20 |
| Joe James | 2032-2033 | .254 | 5 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Kenny James | 2035-2037 | .000 | 0 | 0 | 24 | 15 | 0 | 3.29 | 308 |
| Jay Jamieson | 2033-2033 | .324 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Andrew Jamison | 2029-2029 | .000 | 0 | 0 | 2 | 0 | 1 | 3.91 | 19 |
| An Jang-Yop | 2024-2024 | .000 | 0 | 0 | 2 | 1 | 14 | 2.06 | 68 |
| Scott Janousek | 2024-2024 | .261 | 8 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Maxime Janssens | 2025-2025 | .000 | 0 | 0 | 1 | 2 | 0 | 5.85 | 12 |
| Alberto Jaramillo | 2036-2036 | .000 | 0 | 0 | 0 | 0 | 1 | 2.25 | 24 |
| Jesús Jaramillo | 2028-2029 | .252 | 3 | 33 | 0 | 0 | 0 | 0.00 | 0 |
| Nelson Jaramillo | 2028-2028 | .251 | 4 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Kostenka Jarovtsev | 2026-2030 | .000 | 0 | 0 | 3 | 12 | 0 | 4.51 | 77 |
| Miika Jarvi | 2029-2033 | .000 | 0 | 0 | 6 | 10 | 8 | 3.06 | 163 |
| Mauro Jasso | 2037-2038 | .237 | 15 | 54 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Javier Jr. | 2020-2022 | .247 | 13 | 91 | 0 | 0 | 0 | 0.00 | 0 |
| Everette Jeffers | 2022-2022 | .211 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Jelarde | 2020-2020 | .500 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Rashid Jeltkov | 2038-2039 | .201 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Brenton Jenkins | 2039-2039 | .000 | 0 | 0 | 3 | 7 | 0 | 3.81 | 62 |
| Mike Jennings | 2027-2028 | .235 | 12 | 74 | 0 | 0 | 0 | 0.00 | 0 |
| Jerry Jensen | 2026-2026 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Adam Jensson | 2032-2032 | .228 | 3 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Denis Jerningham | 2027-2027 | .233 | 1 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Tak-wai Jia | 2034-2036 | .251 | 2 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Dong-hua Jianbua | 2033-2037 | .260 | 3 | 13 | 0 | 0 | 0 | 0.00 | 0 |
| António Jiménez | 2022-2022 | .265 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Aurelio Jiménez | 2026-2026 | .189 | 1 | 18 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Esteban Jiménez | 2026-2026 | .000 | 0 | 0 | 5 | 0 | 26 | 0.93 | 68 |
| Felipe Jiménez | 2021-2021 | .207 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Jiménez | 2022-2023 | .244 | 1 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Jiménez | 2024-2026 | .000 | 0 | 0 | 9 | 2 | 2 | 2.24 | 102 |
| Gilberto Jiménez | 2025-2025 | .242 | 1 | 12 | 0 | 0 | 0 | 0.00 | 0 |
| José Jiménez | 2026-2026 | .155 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Jiménez | 2021-2024 | .000 | 0 | 0 | 17 | 8 | 7 | 3.79 | 124 |
| Pedro Jiménez | 2020-2021 | .225 | 1 | 9 | 0 | 0 | 0 | 0.00 | 0 |
| Tobias Jimenez | 2028-2028 | .265 | 1 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Jimínez | 2032-2032 | .320 | 3 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Si-xun Jin | 2038-2038 | .182 | 2 | 7 | 0 | 0 | 0 | 0.00 | 0 |
| Gang Jing | 2030-2034 | .220 | 35 | 158 | 0 | 0 | 0 | 0.00 | 0 |
| Edward Johnson | 2039-2039 | .255 | 1 | 19 | 0 | 0 | 0 | 0.00 | 0 |
| Franklin Johnson | 2021-2024 | .000 | 0 | 0 | 0 | 0 | 0 | 6.00 | 2 |
| Kelly Johnson | 2039-2039 | .258 | 0 | 10 | 0 | 0 | 0 | 0.00 | 0 |
| Kenny Johnson | 2034-2036 | .198 | 1 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Johnson | 2028-2028 | .333 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Johnson | 2038-2039 | .000 | 0 | 0 | 2 | 5 | 0 | 5.83 | 50 |
| Mike Johnson | 2029-2029 | .200 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Johnson | 2034-2036 | .201 | 0 | 14 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Johnson | 2021-2022 | .222 | 0 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Census Johnston | 2025-2025 | .000 | 0 | 0 | 2 | 1 | 3 | 3.00 | 16 |
| Jeffery Johnston | 2038-2038 | .000 | 0 | 0 | 2 | 3 | 21 | 0.82 | 51 |
| Preston Johnston | 2036-2036 | .271 | 6 | 42 | 0 | 0 | 0 | 0.00 | 0 |
| Sam Johnston | 2036-2036 | .000 | 0 | 0 | 5 | 9 | 0 | 4.28 | 79 |
| George Johnstone | 2033-2034 | .000 | 0 | 0 | 5 | 7 | 2 | 4.18 | 58 |
| Mike Johnstone | 2039-2039 | .298 | 11 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Nate Johnstone | 2034-2036 | .000 | 0 | 0 | 10 | 22 | 0 | 4.41 | 236 |
| Brandon Jolin | 2029-2032 | .263 | 3 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| Clarence Jones | 2035-2036 | .000 | 0 | 0 | 2 | 22 | 0 | 6.31 | 160 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Derek Jones | 2035-2035 | .000 | 0 | 0 | 7 | 11 | 0 | 5.88 | 114 |
| Jeffrey Jones | 2021-2025 | .191 | 2 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Obi Jones | 2026-2028 | .198 | 1 | 49 | 0 | 0 | 0 | 0.00 | 0 |
| Robert Jones | 2020-2020 | .500 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Jones | 2022-2022 | .389 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Timothy Jones | 2022-2022 | .193 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Vaughan Jones | 2036-2037 | .000 | 0 | 0 | 0 | 2 | 0 | 4.45 | 37 |
| Chris Jordan | 2036-2037 | .000 | 0 | 0 | 3 | 4 | 2 | 5.05 | 78 |
| Jorgen Jorgenson | 2036-2038 | .228 | 15 | 80 | 0 | 0 | 0 | 0.00 | 0 |
| Manu Jortikka | 2037-2039 | .000 | 0 | 0 | 7 | 2 | 0 | 2.28 | 115 |
| Daniel Joseph | 2036-2036 | .230 | 5 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Otto Joseph | 2030-2030 | .000 | 0 | 0 | 8 | 1 | 0 | 1.90 | 76 |
| Rob Joseph | 2039-2039 | .000 | 0 | 0 | 2 | 4 | 3 | 3.48 | 36 |
| Richard Jost | 2028-2028 | .169 | 0 | 8 | 0 | 0 | 0 | 0.00 | 0 |
| Jose Jovellanos | 2034-2037 | .000 | 0 | 0 | 7 | 11 | 1 | 3.93 | 188 |
| Jack Joyner | 2032-2032 | .000 | 0 | 0 | 7 | 0 | 0 | 1.38 | 52 |
| Ken Joyner | 2038-2038 | .275 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Gabriel Juárez | 2020-2021 | .261 | 2 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| José Juárez | 2023-2023 | .000 | 0 | 0 | 2 | 1 | 2 | 2.57 | 33 |
| Orlando Juárez | 2022-2022 | .000 | 0 | 0 | 0 | 0 | 0 | 2.25 | 5 |
| Tony Juderías | 2039-2039 | .355 | 4 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Júlio | 2027-2028 | .000 | 0 | 0 | 4 | 6 | 0 | 3.75 | 63 |
| Júlio Justiniano | 2029-2033 | .000 | 0 | 0 | 11 | 16 | 16 | 4.01 | 124 |
| Behar Jusufi | 2026-2029 | .000 | 0 | 0 | 10 | 19 | 0 | 3.48 | 302 |
| Markus Jutzi | 2039-2039 | .000 | 0 | 0 | 3 | 3 | 0 | 5.23 | 53 |
