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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Graham | SP | Boston (WIN) Red Sox | 22 | 08/06/2025 | Toronto | CAN | Switch | Right | 6' 2" | 190 lbs | - |
| Jalil, Emir | RF | Chicago (WIN) Cubs | 22 | 09/13/2025 | Ibri | OMA | Left | Left | 6' 6" | 200 lbs | - |
| Jamison, Kevon | SP | St. Louis (WIN) Cardinals | 24 | 05/18/2023 | Los Angeles | USA | Switch | Right | 6' 7" | 205 lbs | - |
| Jarvis, Ian | C | Arizona (WIN) Diamondbacks | 33 | 11/09/2014 | Maywood | USA | Left | Right | 5' 10" | 190 lbs | - |
| Jenkins, Ken | SS | Baltimore (WIN) Orioles | 29 | 05/11/2018 | McCandless Township | USA | Right | Right | 6' 1" | 190 lbs | - |
| JimAnez, Jerry | RP | Chicago (WIN) White Sox | 24 | 02/19/2023 | Pacora | PAN | Switch | Right | 6' 0" | 205 lbs | $675,000 |
| Jimenez, Jose | RF | St. Louis (WIN) Cardinals | 24 | 11/18/2023 | San Juan | PUR | Right | Left | 6' 6" | 200 lbs | - |
| Jimenez, Willie | RP | Houston (WIN) Astros | 24 | 11/24/2023 | La Vega | DOM | Left | Right | 6' 2" | 195 lbs | $675,000 |
| Jimenez, Willie | SP | Minnesota (WIN) Twins | 22 | 12/11/2025 | Ranchuelo | CUB | Right | Left | 6' 2" | 200 lbs | - |
| Joe, Zhao-ying | SP | New York (WIN) Mets | 22 | 11/06/2025 | Hsinchuang | TPE | Right | Right | 6' 1" | 170 lbs | - |
| Johansen, Ron | 1B | Chicago (WIN) White Sox | 26 | 07/14/2021 | Memphis | USA | Right | Right | 6' 1" | 185 lbs | - |
| Johnson, Matt | SP | Cincinnati (WIN) Reds | 23 | 03/01/2024 | South San Francisco | USA | Right | Right | 6' 0" | 175 lbs | $675,000 |
| Jones, Cory | RP | Washington (WIN) Nationals | 23 | 02/16/2024 | Maryland Heights | USA | Right | Right | 6' 2" | 190 lbs | $675,000 |
| Jones, Josh | 1B | New York (WIN) Mets | 22 | 08/07/2025 | Brooklyn | USA | Right | Right | 6' 1" | 185 lbs | $675,000 |
| Jones, Killian | 1B | Pittsburgh (WIN) Pirates | 26 | 06/01/2021 | Whitby | CAN | Right | Right | 6' 2" | 195 lbs | - |
| Jordan, John | RP | Boston (WIN) Red Sox | 25 | 10/08/2022 | Baldwin Park | USA | Right | Right | 6' 4" | 200 lbs | $675,000 |
| Joseph, Curt | RP | Houston (WIN) Astros | 25 | 06/01/2022 | Albany | USA | Left | Left | 6' 4" | 205 lbs | $675,000 |
| Juarez, Manuel | C | Minnesota (WIN) Twins | 24 | 03/18/2023 | South Amherst | USA | Right | Right | 6' 1" | 200 lbs | - |
| Julien, Nick | 2B | Kansas City (WIN) Royals | 21 | 01/23/2026 | Montreal | CAN | Right | Right | 6' 3" | 185 lbs | - |
| Justice, Rich | 3B | Seattle (WIN) Mariners | 25 | 04/08/2022 | Los Angeles | USA | Right | Right | 6' 5" | 200 lbs | - |
