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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Eric | CF | Baltimore (WIN) Orioles | 21 | 03/29/2024 | Lawrence | USA | Left | Left | 6' 1" | 195 lbs | - |
| Jackson, John | C | Miami (WIN) Marlins | 30 | 05/20/2015 | Carol Stream | USA | Right | Right | 6' 0" | 200 lbs | - |
| Jackson, Vince | SS | Baltimore (WIN) Orioles | 22 | 11/06/2023 | Garfield | USA | Right | Right | 6' 0" | 185 lbs | $650,000 |
| Jauregui, Jerry | 1B | Texas (WIN) Rangers | 30 | 06/04/2015 | Tepic | MEX | Right | Right | 6' 3" | 195 lbs | - |
| Joe, Zhao-ying | SP | New York (WIN) Mets | 20 | 11/06/2025 | Hsinchuang | TPE | Right | Right | 6' 1" | 170 lbs | - |
| Johnson, Jaylen | RP | Free Agent | 25 | 11/10/2020 | Chantilly | USA | Right | Right | 6' 0" | 180 lbs | - |
| Johnson, Tristan | SP | Free Agent | 27 | 09/30/2018 | Hampton Township | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Jonas, Chris | 1B | Miami (WIN) Marlins | 31 | 10/24/2014 | Rosemead | USA | Left | Left | 6' 7" | 215 lbs | - |
| Jones, Cory | RP | Washington (WIN) Nationals | 21 | 02/16/2024 | Maryland Heights | USA | Right | Right | 6' 2" | 185 lbs | - |
| Jones, Kelvin | RF | Houston (WIN) Astros | 22 | 08/17/2023 | San Rafael | USA | Left | Left | 6' 0" | 190 lbs | - |
| Jones, Killian | 1B | Pittsburgh (WIN) Pirates | 24 | 06/01/2021 | Whitby | CAN | Right | Right | 6' 2" | 200 lbs | - |
| Jones, Mike | 3B | San Francisco (WIN) Giants | 25 | 08/05/2020 | Plainfield | USA | Right | Right | 6' 2" | 190 lbs | - |
| Jones, Spencer | SP | Toronto (WIN) Blue Jays | 21 | 03/26/2024 | Anse-la-Raye | LCA | Switch | Left | 6' 4" | 210 lbs | $650,000 |
| Joo, Tai | C | Free Agent | 26 | 11/08/2019 | Taipei | TPE | Right | Right | 6' 1" | 200 lbs | - |
| Jordahl, Joe | SP | Kansas City (WIN) Royals | 24 | 04/21/2021 | Center Point | USA | Right | Right | 6' 3" | 195 lbs | $650,000 |
| Jordan, Omar | 1B | San Francisco (WIN) Giants | 25 | 07/21/2020 | Memphis | USA | Right | Right | 6' 4" | 200 lbs | - |
| Joseph, Steffen | RP | Minnesota (WIN) Twins | 34 | 07/25/2011 | Ostermundingen | SUI | Right | Right | 6' 0" | 200 lbs | $2,800,000 |
| Joslin, Xavier | 1B | Boston (WIN) Red Sox | 24 | 06/24/2021 | Jensen Beach | USA | Right | Right | 6' 0" | 195 lbs | - |
| Joyner, Aaron | CF | New York (WIN) Yankees | 20 | 06/19/2025 | Columbia | USA | Left | Right | 6' 3" | 190 lbs | - |
| Juarez, Jon | RP | Baltimore (WIN) Orioles | 25 | 07/01/2020 | The Colony | USA | Right | Right | 5' 11" | 185 lbs | - |
| Justice, Rich | 3B | San Diego (WIN) Padres | 23 | 04/08/2022 | Los Angeles | USA | Right | Right | 6' 5" | 200 lbs | - |
