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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jack, Tyler | RP | Round Rock Express | 35 | 08/05/2011 | Farmington | USA | Right | Right | 6' 1" | 200 lbs | - |
| Jackson, Dave | SP | Salt Lake Bees | 23 | 11/28/2023 | Greenfield | USA | Right | Right | 6' 2" | 175 lbs | $675,000 |
| Jackson, John | C | New Orleans Zephyrs | 31 | 05/20/2015 | Carol Stream | USA | Right | Right | 6' 0" | 200 lbs | - |
| Jacobson, Corey | RP | Free Agent | 30 | 08/15/2016 | Carson City | USA | Right | Right | 6' 2" | 200 lbs | - |
| James, Elijah | RP | Free Agent | 29 | 10/09/2017 | Dudley | USA | Right | Right | 6' 2" | 200 lbs | - |
| Jansma, Ryan | RP | Free Agent | 28 | 08/25/2018 | Towanda | USA | Left | Left | 6' 7" | 200 lbs | - |
| Jaquez, Mike | 2B | Omaha Storm Chasers | 23 | 06/22/2023 | San Francisco de Macorís | DOM | Right | Right | 6' 1" | 195 lbs | $5,290,000 |
| Jenkins, Ken | SS | Norfolk Tides | 28 | 05/11/2018 | McCandless Township | USA | Right | Right | 6' 1" | 195 lbs | - |
| Jensen, Andy | RP | Free Agent | 27 | 12/08/2019 | Las Vegas | USA | Right | Right | 6' 0" | 155 lbs | - |
| Jensen, Tom | SP | Omaha Storm Chasers | 26 | 03/19/2020 | New Orleans | USA | Right | Right | 6' 6" | 200 lbs | $1,980,000 |
| Jimenez, Mario | RP | Gwinnett Braves | 35 | 09/16/2011 | Jarabacoa | DOM | Left | Left | 6' 3" | 200 lbs | - |
| Jivotovsky, Helge | LF | Free Agent | 34 | 06/24/2012 | Riga | LVA | Left | Left | 6' 1" | 200 lbs | - |
| Johnson, Curt | 3B | Louisville Bats | 37 | 08/03/2009 | Matthews | USA | Left | Right | 6' 1" | 200 lbs | - |
| Johnson, Steve | RP | Columbus Clippers | 34 | 06/20/2012 | Beach Haven West | USA | Right | Left | 6' 2" | 190 lbs | - |
| Jones, Justin | SP | Indianapolis Indians | 28 | 11/20/2018 | Reading | USA | Right | Right | 6' 9" | 200 lbs | - |
| Jones, Kelvin | RF | Fresno Grizzlies | 23 | 08/17/2023 | San Rafael | USA | Left | Left | 6' 0" | 200 lbs | - |
| Jones, Mike | LF | Pawtucket Red Sox | 26 | 03/21/2020 | Metairie | USA | Left | Left | 6' 3" | 200 lbs | - |
| Joslin, Xavier | 1B | Pawtucket Red Sox | 25 | 06/24/2021 | Jensen Beach | USA | Right | Right | 6' 0" | 195 lbs | - |
| Joyner, Aaron | CF | Scranton WB RailRiders | 21 | 06/19/2025 | Columbia | USA | Left | Right | 6' 3" | 195 lbs | - |
| Jung, Sung-hwan | C | Iowa Cubs | 27 | 07/03/2019 | Jeonju | KOR | Right | Right | 6' 1" | 200 lbs | - |
| Jurado, Manny | RF | Free Agent | 28 | 12/10/2018 | Gillett | USA | Right | Right | 6' 4" | 200 lbs | - |
