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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Daniel | RF | Baltimore (WIN) Orioles | 24 | 05/31/2025 | Laurens | USA | Right | Right | 6' 4" | 200 lbs | $675,000 |
| Jackson, Dave | SP | Los Angeles (WIN) Angels | 26 | 11/28/2023 | Greenfield | USA | Right | Right | 6' 2" | 180 lbs | $675,000 |
| Jackson, Eric | RF | Atlanta (WIN) Braves | 25 | 03/29/2024 | Lawrence | USA | Left | Left | 6' 1" | 200 lbs | - |
| Jackson, Graham | SP | Boston (WIN) Red Sox | 24 | 08/06/2025 | Toronto | CAN | Switch | Right | 6' 2" | 200 lbs | $675,000 |
| Jackson, Marty | RP | Houston (WIN) Astros | 21 | 04/26/2028 | Fruitvale | CAN | Right | Right | 6' 2" | 190 lbs | - |
| Jacobsen, Trevor | SP | Seattle (WIN) Mariners | 27 | 08/31/2022 | Keller | USA | Left | Right | 6' 1" | 200 lbs | - |
| Jalil, Emir | RF | Chicago (WIN) Cubs | 24 | 09/13/2025 | Ibri | OMA | Left | Left | 6' 6" | 200 lbs | - |
| Jamison, Kevon | SP | St. Louis (WIN) Cardinals | 26 | 05/18/2023 | Los Angeles | USA | Switch | Right | 6' 7" | 205 lbs | - |
| Jansen, Shawn | 3B | Los Angeles (WIN) Angels | 18 | 09/16/2031 | Newark | USA | Right | Right | 6' 1" | 180 lbs | - |
| Jardine, Jim | 2B | Los Angeles (WIN) Dodgers | 22 | 01/26/2027 | Halifax | CAN | Left | Right | 6' 2" | 200 lbs | - |
| Jarvis, Ian | C | Arizona (WIN) Diamondbacks | 35 | 11/09/2014 | Maywood | USA | Left | Right | 5' 10" | 195 lbs | - |
| Jensen, Danny | C | Los Angeles (WIN) Dodgers | 26 | 08/09/2023 | Brooklyn | USA | Switch | Right | 5' 11" | 185 lbs | - |
| Jensen, Tom | RP | Texas (WIN) Rangers | 29 | 03/19/2020 | New Orleans | USA | Right | Right | 6' 6" | 200 lbs | - |
| Jerome, Guy | 2B | Los Angeles (WIN) Dodgers | 22 | 10/22/2027 | Mississauga | CAN | Switch | Right | 6' 2" | 180 lbs | - |
| Jimenez, Willie | SP | Minnesota (WIN) Twins | 24 | 12/11/2025 | Ranchuelo | CUB | Right | Left | 6' 2" | 200 lbs | $675,000 |
| Jobe, Tim | 2B | St. Louis (WIN) Cardinals | 24 | 04/11/2025 | Phoenix | USA | Right | Right | 6' 4" | 200 lbs | - |
| Joe, Yeong-hun | SS | San Francisco (WIN) Giants | 28 | 01/22/2021 | Pyongyang | PRK | Left | Right | 6' 1" | 200 lbs | - |
| Joe, Zhao-ying | SP | New York (WIN) Mets | 24 | 11/06/2025 | Hsinchuang | TPE | Right | Right | 6' 1" | 180 lbs | $675,000 |
| Johansen, Ron | 1B | Chicago (WIN) White Sox | 28 | 07/14/2021 | Memphis | USA | Right | Right | 6' 1" | 190 lbs | - |
| Johnson, Logan | 2B | Cincinnati (WIN) Reds | 22 | 04/21/2027 | Old Bethpage | USA | Right | Right | 6' 1" | 200 lbs | - |
| Johnson, Matt | SP | Cincinnati (WIN) Reds | 25 | 03/01/2024 | South San Francisco | USA | Right | Right | 6' 0" | 185 lbs | $675,000 |
| Johnston, Bryan | C | Toronto (WIN) Blue Jays | 26 | 10/12/2023 | Tampa | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Jones, Cory | RP | Washington (WIN) Nationals | 25 | 02/16/2024 | Maryland Heights | USA | Right | Right | 6' 2" | 190 lbs | $675,000 |
| Jones, McGwire | 3B | St. Louis (WIN) Cardinals | 22 | 12/06/2027 | St. Louis | USA | Right | Right | 6' 6" | 200 lbs | - |
| Jones, Steve | SS | San Francisco (WIN) Giants | 27 | 10/05/2022 | Dedham | USA | Right | Right | 6' 2" | 200 lbs | - |
| Joo, Tai | C | Seattle (WIN) Mariners | 30 | 11/08/2019 | Taipei | TPE | Right | Right | 6' 1" | 200 lbs | - |
| Jordan, T.J. | C | Arizona (WIN) Diamondbacks | 35 | 04/09/2014 | Richwood | USA | Right | Right | 6' 0" | 195 lbs | - |
| Joseph, Aaron | LF | Los Angeles (WIN) Dodgers | 26 | 04/24/2023 | Fairfield | USA | Right | Right | 6' 4" | 205 lbs | - |
| Juarez, Angel | SP | Pittsburgh (WIN) Pirates | 21 | 04/25/2028 | San José | CRC | Left | Left | 6' 5" | 185 lbs | - |
| Juarez, Manuel | C | Minnesota (WIN) Twins | 26 | 03/18/2023 | South Amherst | USA | Right | Right | 6' 1" | 200 lbs | $675,000 |
| Julien, Chris | SP | Seattle (WIN) Mariners | 26 | 04/28/2023 | Youngstown | USA | Right | Right | 6' 2" | 200 lbs | - |
| Julien, Nick | 2B | Kansas City (WIN) Royals | 23 | 01/23/2026 | Montreal | CAN | Right | Right | 6' 3" | 195 lbs | - |
| Jung, Sung-hwan | C | San Diego (WIN) Padres | 30 | 07/03/2019 | Jeonju | KOR | Right | Right | 6' 1" | 200 lbs | - |
