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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 |
|---|---|---|---|---|---|---|---|---|---|
| Cal Jackson | 2016-2021 | .271 | 50 | 232 | 0 | 0 | 0 | 0.00 | 0 |
| Jason Jackson | 2019-2019 | .000 | 0 | 0 | 1 | 1 | 0 | 6.14 | 38 |
| Kent Jackson | 2020-2020 | .227 | 4 | 16 | 0 | 0 | 0 | 0.00 | 0 |
| Leroy Jackson | 2017-2018 | .000 | 0 | 0 | 4 | 11 | 0 | 6.15 | 110 |
| Abraham Jacobs | 2022-2022 | .228 | 7 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Jacobs | 2018-2020 | .000 | 0 | 0 | 12 | 7 | 4 | 3.10 | 95 |
| Brad Jacobson | 2021-2022 | .230 | 4 | 38 | 0 | 0 | 0 | 0.00 | 0 |
| Justin Jamerson | 2015-2023 | .000 | 0 | 0 | 15 | 13 | 7 | 5.86 | 227 |
| Cal James | 2016-2016 | .250 | 1 | 6 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard James | 2015-2020 | .283 | 14 | 89 | 0 | 0 | 0 | 0.00 | 0 |
| Wallace James | 2015-2020 | .297 | 20 | 170 | 0 | 0 | 0 | 0.00 | 0 |
| Wilbur James | 2019-2019 | .288 | 4 | 25 | 0 | 0 | 0 | 0.00 | 0 |
| An Jang-Yop | 2024-2025 | .000 | 0 | 0 | 2 | 1 | 28 | 1.85 | 67 |
| Scott Janousek | 2025-2025 | .277 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Gerd Jans | 2015-2015 | .000 | 0 | 0 | 1 | 1 | 0 | 6.06 | 13 |
| Nelson Jaramillo | 2028-2028 | .179 | 0 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Raúl Javier | 2015-2016 | .000 | 0 | 0 | 1 | 0 | 0 | 4.30 | 18 |
| Raúl Javier Jr. | 2025-2025 | .311 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Everette Jeffers | 2023-2024 | .267 | 1 | 27 | 0 | 0 | 0 | 0.00 | 0 |
| William Jefferson | 2015-2016 | .286 | 15 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Luis Jelarde | 2020-2028 | .265 | 48 | 205 | 0 | 0 | 0 | 0.00 | 0 |
| Rudy Jenkins | 2019-2021 | .000 | 0 | 0 | 15 | 18 | 0 | 3.49 | 273 |
| Mitch Jensen | 2016-2016 | .279 | 16 | 53 | 0 | 0 | 0 | 0.00 | 0 |
| Denis Jerningham | 2027-2028 | .274 | 0 | 24 | 0 | 0 | 0 | 0.00 | 0 |
| António Jiménez | 2025-2025 | .283 | 2 | 40 | 0 | 0 | 0 | 0.00 | 0 |
| Esteban Jiménez | 2027-2027 | .000 | 0 | 0 | 1 | 0 | 12 | 1.94 | 60 |
| Felipe Jiménez | 2022-2024 | .241 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Fernando Jiménez | 2024-2025 | .212 | 0 | 3 | 0 | 0 | 0 | 0.00 | 0 |
| Francisco Jiménez | 2027-2028 | .000 | 0 | 0 | 3 | 5 | 1 | 6.27 | 74 |
| Miguel Jiménez | 2024-2024 | .000 | 0 | 0 | 0 | 0 | 1 | 0.54 | 11 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Pedro Jiménez | 2018-2021 | .261 | 10 | 93 | 0 | 0 | 0 | 0.00 | 0 |
| Ray John | 2019-2019 | .306 | 6 | 41 | 0 | 0 | 0 | 0.00 | 0 |
| Franklin Johnson | 2015-2024 | .000 | 0 | 0 | 6 | 5 | 14 | 6.11 | 116 |
| Gregory Johnson | 2015-2016 | .330 | 8 | 109 | 0 | 0 | 0 | 0.00 | 0 |
| Kevin Johnson | 2027-2028 | .197 | 6 | 37 | 0 | 0 | 0 | 0.00 | 0 |
| Paul Johnson | 2020-2023 | .204 | 0 | 4 | 0 | 0 | 0 | 0.00 | 0 |
| Quinn Johnson | 2018-2020 | .178 | 5 | 36 | 0 | 0 | 0 | 0.00 | 0 |
| Ralph Johnson | 2015-2016 | .315 | 16 | 75 | 0 | 0 | 0 | 0.00 | 0 |
| Rick Johnson | 2021-2021 | .260 | 5 | 28 | 0 | 0 | 0 | 0.00 | 0 |
| Stephen Johnson | 2022-2025 | .274 | 3 | 82 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Johnson | 2020-2021 | .265 | 5 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Jim Johnstone | 2020-2020 | .000 | 0 | 0 | 0 | 1 | 0 | 12.15 | 5 |
| Gary Jones | 2015-2015 | .000 | 0 | 0 | 0 | 0 | 0 | 0.00 | 4 |
| Jeffrey Jones | 2024-2024 | .261 | 3 | 21 | 0 | 0 | 0 | 0.00 | 0 |
| Joey Jones | 2017-2017 | .310 | 8 | 30 | 0 | 0 | 0 | 0.00 | 0 |
| Kip Jones | 2016-2016 | .367 | 1 | 5 | 0 | 0 | 0 | 0.00 | 0 |
| Larry Jones | 2015-2016 | .340 | 15 | 67 | 0 | 0 | 0 | 0.00 | 0 |
| Leonard Jones | 2020-2021 | .268 | 4 | 22 | 0 | 0 | 0 | 0.00 | 0 |
| Steve Jones | 2024-2024 | .240 | 4 | 26 | 0 | 0 | 0 | 0.00 | 0 |
| Steven Jones | 2019-2024 | .000 | 0 | 0 | 3 | 4 | 12 | 3.13 | 66 |
| Teddy Jones | 2017-2019 | .000 | 0 | 0 | 17 | 18 | 5 | 4.54 | 310 |
| Charles Jordan | 2026-2026 | .250 | 0 | 2 | 0 | 0 | 0 | 0.00 | 0 |
| Mimosa Joseph | 2022-2022 | .000 | 0 | 0 | 3 | 2 | 0 | 3.44 | 26 |
| Richard Jost | 2028-2028 | .346 | 10 | 39 | 0 | 0 | 0 | 0.00 | 0 |
| Ed Jozwiak | 2027-2028 | .259 | 2 | 31 | 0 | 0 | 0 | 0.00 | 0 |
| Gabriel Juárez | 2021-2022 | .284 | 3 | 62 | 0 | 0 | 0 | 0.00 | 0 |
| José Juárez | 2023-2024 | .000 | 0 | 0 | 3 | 5 | 27 | 3.90 | 50 |
| José Juárez | 2023-2023 | .000 | 0 | 0 | 1 | 0 | 0 | 2.25 | 3 |
| José Juárez | 2027-2028 | .292 | 5 | 23 | 0 | 0 | 0 | 0.00 | 0 |
| Miguel Juárez | 2017-2018 | .303 | 8 | 51 | 0 | 0 | 0 | 0.00 | 0 |
| Player | From-To | Avg | HR | RBI | W | L | SV | ERA | K |
| Fernando Júlio | 2028-2028 | .000 | 0 | 0 | 0 | 4 | 2 | 4.17 | 35 |
| Tony Justice | 2024-2024 | .273 | 0 | 1 | 0 | 0 | 0 | 0.00 | 0 |
