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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Graham | SP | Boston (WIN) Red Sox | 21 | 08/06/2025 | Toronto | CAN | Switch | Right | 6' 2" | 190 lbs | - |
| Jackson, Vince | 2B | Baltimore (WIN) Orioles | 23 | 11/06/2023 | Garfield | USA | Right | Right | 6' 0" | 190 lbs | $675,000 |
| James, David | RP | Cincinnati (WIN) Reds | 25 | 04/05/2021 | Philadelphia | USA | Left | Left | 6' 2" | 200 lbs | $1,700,000 |
| Jamison, Kevon | SP | St. Louis (WIN) Cardinals | 23 | 05/18/2023 | Los Angeles | USA | Switch | Right | 6' 7" | 205 lbs | - |
| Jamison, Nick | RP | San Diego (WIN) Padres | 32 | 08/06/2014 | Holly Hill | USA | Right | Right | 6' 1" | 195 lbs | - |
| Jarrells, Terry | 2B | Los Angeles (WIN) Dodgers | 37 | 12/12/2009 | Lake St. Louis | USA | Right | Right | 6' 4" | 200 lbs | - |
| Jarvis, Ian | C | Arizona (WIN) Diamondbacks | 32 | 11/09/2014 | Maywood | USA | Left | Right | 5' 10" | 190 lbs | - |
| JimAnez, Jerry | RP | Chicago (WIN) White Sox | 23 | 02/19/2023 | Pacora | PAN | Switch | Right | 6' 0" | 200 lbs | $675,000 |
| Joe, Zhao-ying | SP | New York (WIN) Mets | 21 | 11/06/2025 | Hsinchuang | TPE | Right | Right | 6' 1" | 170 lbs | - |
| Johnson, Matt | SP | Cincinnati (WIN) Reds | 22 | 03/01/2024 | South San Francisco | USA | Right | Right | 6' 0" | 170 lbs | $675,000 |
| Jones, Cory | RP | Washington (WIN) Nationals | 22 | 02/16/2024 | Maryland Heights | USA | Right | Right | 6' 2" | 185 lbs | $675,000 |
| Jones, Josh | 2B | New York (WIN) Mets | 21 | 08/07/2025 | Brooklyn | USA | Right | Right | 6' 1" | 185 lbs | - |
| Jones, Killian | 1B | Pittsburgh (WIN) Pirates | 25 | 06/01/2021 | Whitby | CAN | Right | Right | 6' 2" | 200 lbs | - |
| Jones, Mike | 3B | San Francisco (WIN) Giants | 26 | 08/05/2020 | Plainfield | USA | Right | Right | 6' 2" | 195 lbs | - |
| Jordahl, Joe | SP | Kansas City (WIN) Royals | 25 | 04/21/2021 | Center Point | USA | Right | Right | 6' 3" | 200 lbs | $675,000 |
| Jordan, T.J. | C | Los Angeles (WIN) Dodgers | 32 | 04/09/2014 | Richwood | USA | Right | Right | 6' 0" | 200 lbs | - |
| Juarez, Manuel | C | Minnesota (WIN) Twins | 23 | 03/18/2023 | South Amherst | USA | Right | Right | 6' 1" | 200 lbs | - |
