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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 |
|---|---|---|---|---|---|---|---|---|---|
| Dean Jackson | 2034-2034 | .272 | 10 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Cody Jaeckel | 2027-2029 | .235 | 6 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Milos Jaksch | 2028-2032 | .288 | 15 | 149 | 0 | 0 | 0 | 0.00 | 0 |
| Mike James | 2034-2034 | .273 | 0 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Andrew Jamison | 2030-2030 | .000 | 0 | 0 | 2 | 2 | 0 | 4.85 | 45 |
| An Jang-Yop | 2023-2023 | .000 | 0 | 0 | 1 | 0 | 2 | 2.61 | 52 |
| Lex Janssen | 2034-2034 | .000 | 0 | 0 | 2 | 1 | 3 | 2.77 | 15 |
| Stuart Janssen | 2031-2032 | .298 | 2 | 17 | 0 | 0 | 0 | 0.00 | 0 |
| Cornelio Japón | 2033-2034 | .184 | 1 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Ángel Jaramillo | 2032-2032 | .000 | 0 | 0 | 4 | 0 | 1 | 2.16 | 34 |
| Jesús Jaramillo | 2030-2033 | .270 | 3 | 46 | 0 | 0 | 0 | 0.00 | 0 |
| Nelson Jaramillo | 2027-2027 | .249 | 2 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| José Jarca | 2025-2025 | .275 | 13 | 47 | 0 | 0 | 0 | 0.00 | 0 |
| Miika Jarvi | 2034-2034 | .000 | 0 | 0 | 0 | 1 | 0 | 4.66 | 19 |
| Atro Jarvilehto | 2028-2030 | .335 | 3 | 59 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Jelarde | 2021-2023 | .298 | 13 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Gary Jenkins | 2032-2032 | .227 | 5 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Jenson | 2028-2030 | .000 | 0 | 0 | 2 | 5 | 5 | 4.70 | 73 |
| Adam Jensson | 2033-2034 | .251 | 6 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| John Jewell | 2030-2031 | .000 | 0 | 0 | 11 | 12 | 0 | 3.86 | 146 |
| Tung Ji | 2028-2028 | .245 | 1 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| António Jiménez | 2033-2034 | .000 | 0 | 0 | 7 | 11 | 2 | 6.13 | 125 |
| Aurelio Jiménez | 2027-2030 | .248 | 15 | 121 | 0 | 0 | 0 | 0.00 | 0 |
| Dallas Jiménez | 2031-2032 | .230 | 3 | 34 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Jiménez | 2025-2025 | .000 | 0 | 0 | 2 | 1 | 16 | 0.77 | 34 |
| Felipe Jiménez | 2020-2020 | .217 | 2 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Gilberto Jiménez | 2024-2024 | .229 | 2 | 15 | 0 | 0 | 0 | 0.00 | 0 |
| José Jiménez | 2025-2026 | .250 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Jiménez | 2028-2029 | .000 | 0 | 0 | 10 | 8 | 0 | 2.37 | 128 |
| Miguel Jiménez | 2020-2020 | .000 | 0 | 0 | 1 | 3 | 8 | 3.55 | 24 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Tobias Jimenez | 2029-2032 | .235 | 11 | 43 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Jimínez | 2028-2031 | .222 | 12 | 100 | 0 | 0 | 0 | 0.00 | 0 |
| Sisay Jitu | 2026-2027 | .139 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Ton Jobse | 2029-2029 | .000 | 0 | 0 | 1 | 2 | 0 | 7.63 | 21 |
| Clifford Johnson | 2034-2034 | .220 | 1 | 11 | 0 | 0 | 0 | 0.00 | 0 |
| Franklin Johnson | 2025-2025 | .000 | 0 | 0 | 1 | 1 | 0 | 2.87 | 4 |
| Gary Johnson | 2033-2033 | .000 | 0 | 0 | 0 | 1 | 0 | 6.57 | 20 |
| Keith Johnson | 2031-2032 | .000 | 0 | 0 | 5 | 2 | 6 | 2.50 | 52 |
| Kenny Johnson | 2033-2033 | .232 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Johnson | 2024-2026 | .233 | 8 | 57 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Johnson | 2026-2028 | .179 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Doug Johnston | 2032-2032 | .344 | 1 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Phil Johnston | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Ron Johnston | 2022-2024 | .271 | 1 | 48 | 0 | 0 | 0 | 0.00 | 0 |
| Sam Johnston | 2034-2034 | .000 | 0 | 0 | 2 | 6 | 0 | 4.52 | 75 |
| Ethan Jollymour | 2021-2021 | .182 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Derek Jones | 2034-2034 | .000 | 0 | 0 | 6 | 8 | 0 | 4.28 | 107 |
| Jeffrey Jones | 2023-2023 | .136 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Leon Jones | 2020-2021 | .000 | 0 | 0 | 1 | 5 | 0 | 4.34 | 67 |
| Nate Jones | 2031-2031 | .000 | 0 | 0 | 2 | 6 | 0 | 5.75 | 63 |
| Steffen Jones | 2034-2034 | .125 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Jones | 2021-2021 | .000 | 0 | 0 | 0 | 0 | 0 | 1.72 | 21 |
| Gojong Joseon | 2029-2029 | .000 | 0 | 0 | 5 | 2 | 24 | 1.88 | 62 |
| Charles Josse | 2034-2034 | .307 | 2 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Ricco Jovine | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| Jack Joyner | 2031-2031 | .000 | 0 | 0 | 3 | 1 | 3 | 1.87 | 79 |
| Ed Jozwiak | 2025-2025 | .354 | 2 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Juárez | 2023-2023 | .500 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
| T.J. Juckson | 2034-2034 | .000 | 0 | 0 | 2 | 1 | 12 | 2.16 | 28 |
| Rusty Justice | 2025-2026 | .209 | 6 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Júlio Justiniano | 2034-2034 | .000 | 0 | 0 | 4 | 0 | 0 | 0.45 | 36 |
