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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, John | C | Miami (WIN) Marlins | 29 | 05/20/2015 | Carol Stream | USA | Right | Right | 6' 0" | 200 lbs | - |
| Jackson, Vince | SS | Baltimore (WIN) Orioles | 21 | 11/06/2023 | Garfield | USA | Right | Right | 6' 0" | 185 lbs | $625,000 |
| Jacobs, Adam | 3B | Washington (WIN) Nationals | 24 | 03/31/2020 | Clarkston Heights-Vineland | USA | Left | Right | 6' 2" | 205 lbs | - |
| James, David | RP | Cincinnati (WIN) Reds | 23 | 04/05/2021 | Philadelphia | USA | Left | Left | 6' 2" | 195 lbs | $625,000 |
| Jansma, Ryan | RP | Philadelphia (WIN) Phillies | 26 | 08/25/2018 | Towanda | USA | Left | Left | 6' 7" | 205 lbs | - |
| Jaquez, Mike | 2B | Kansas City (WIN) Royals | 21 | 06/22/2023 | San Francisco de Macorís | DOM | Right | Right | 6' 1" | 190 lbs | $625,000 |
| Jennings, Jamie | 1B | Houston (WIN) Astros | 24 | 09/20/2020 | Portland | USA | Right | Right | 6' 4" | 200 lbs | - |
| Jensen, Tom | SP | Kansas City (WIN) Royals | 24 | 03/19/2020 | New Orleans | USA | Right | Right | 6' 6" | 200 lbs | $1,400,000 |
| Jimenez, Willie | RP | Houston (WIN) Astros | 21 | 11/24/2023 | La Vega | DOM | Left | Right | 6' 2" | 200 lbs | - |
| Jiu, Manny | RF | Free Agent | 30 | 11/01/2014 | Caracas | VEN | Right | Right | 6' 2" | 200 lbs | - |
| Jonas, Chris | 1B | Miami (WIN) Marlins | 30 | 10/24/2014 | Rosemead | USA | Left | Left | 6' 7" | 215 lbs | - |
| Jones, Bobby | SP | Detroit (WIN) Tigers | 22 | 05/01/2022 | Des Moines | USA | Left | Left | 6' 1" | 190 lbs | - |
| Jones, Darby | RP | Oakland (WIN) Athletics | 29 | 06/13/2015 | Belfast | NIR | Left | Left | 6' 2" | 200 lbs | - |
| Jones, Justin | SP | Pittsburgh (WIN) Pirates | 26 | 11/20/2018 | Reading | USA | Right | Right | 6' 9" | 200 lbs | - |
| Jones, Killian | 1B | Pittsburgh (WIN) Pirates | 23 | 06/01/2021 | Whitby | CAN | Right | Right | 6' 2" | 200 lbs | - |
| Jones, Mike | 3B | San Francisco (WIN) Giants | 24 | 08/05/2020 | Plainfield | USA | Right | Right | 6' 2" | 195 lbs | - |
| Jones, Spencer | SP | Toronto (WIN) Blue Jays | 20 | 03/26/2024 | Anse-la-Raye | LCA | Switch | Left | 6' 4" | 210 lbs | - |
| Jones, Tristan | SP | San Francisco (WIN) Giants | 23 | 04/24/2021 | Paterson | USA | Right | Right | 6' 8" | 200 lbs | - |
| Joo, Tai | C | Arizona (WIN) Diamondbacks | 25 | 11/08/2019 | Taipei | TPE | Right | Right | 6' 1" | 200 lbs | - |
| Jordahl, Joe | SP | Kansas City (WIN) Royals | 23 | 04/21/2021 | Center Point | USA | Right | Right | 6' 3" | 195 lbs | $625,000 |
| Jordan, John | RP | Boston (WIN) Red Sox | 22 | 10/08/2022 | Baldwin Park | USA | Right | Right | 6' 4" | 200 lbs | $625,000 |
| Jordan, Omar | 1B | San Francisco (WIN) Giants | 24 | 07/21/2020 | Memphis | USA | Right | Right | 6' 4" | 200 lbs | - |
| Juarez, Manuel | C | Minnesota (WIN) Twins | 21 | 03/18/2023 | South Amherst | USA | Right | Right | 6' 1" | 195 lbs | - |
