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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 |
|---|---|---|---|---|---|---|---|---|---|
| Cody Jaeckel | 2027-2029 | .235 | 6 | 52 | 0 | 0 | 0 | 0.00 | 0 |
| Milos Jaksch | 2028-2029 | .273 | 5 | 56 | 0 | 0 | 0 | 0.00 | 0 |
| An Jang-Yop | 2023-2023 | .000 | 0 | 0 | 1 | 0 | 2 | 2.61 | 52 |
| 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 |
| Atro Jarvilehto | 2028-2029 | .359 | 0 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Jelarde | 2021-2023 | .298 | 13 | 65 | 0 | 0 | 0 | 0.00 | 0 |
| Mike Jenson | 2028-2029 | .000 | 0 | 0 | 2 | 4 | 3 | 5.23 | 59 |
| Tung Ji | 2028-2028 | .245 | 1 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| Aurelio Jiménez | 2027-2029 | .230 | 8 | 79 | 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 |
| Tobias Jimenez | 2029-2029 | .239 | 4 | 20 | 0 | 0 | 0 | 0.00 | 0 |
| Juan Jimínez | 2028-2029 | .213 | 6 | 69 | 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 |
| Franklin Johnson | 2025-2025 | .000 | 0 | 0 | 1 | 1 | 0 | 2.87 | 4 |
| 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 |
| 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 |
| Ethan Jollymour | 2021-2021 | .182 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| 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 |
| 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 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Ricco Jovine | 2023-2023 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 0 |
| 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 |
| Rusty Justice | 2025-2026 | .209 | 6 | 25 | 0 | 0 | 0 | 0.00 | 0 |
