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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Donald | SP | Brick Barracudas | 25 | 04/19/2011 | New York | USA | Right | Right | 6' 4" | 205 lbs | $300,000 |
| James, Matthew | 1B | Milwaukee Meerkats | 29 | 05/31/2007 | Hornell | USA | Right | Right | 6' 1" | 205 lbs | $300,000 |
| Jenkins, Greg | RP | New Orleans Crawdaddy's | 36 | 10/20/1999 | Brooklyn | USA | Right | Right | 6' 3" | 210 lbs | $10,930,000 |
| Jenkins, Jerome | SP | Atlanta Hurricanes | 19 | 02/05/2017 | Camuy | PUR | Left | Right | 6' 0" | 160 lbs | - |
| Jenkins, Joe | C | Toronto Beavers | 26 | 12/14/2009 | Whitefish Bay | USA | Right | Right | 6' 6" | 240 lbs | $300,000 |
| Jiménez, Juan | SP | Atlanta Hurricanes | 16 | 07/12/2020 | Santo Domingo | DOM | Right | Right | 6' 0" | 165 lbs | - |
| Johnston, Darren | 1B | Free Agent | 19 | 01/13/2017 | Baltimore | USA | Right | Right | 6' 1" | 185 lbs | - |
| Jones, Don | CF | New Orleans Crawdaddy's | 31 | 10/24/2004 | Santa Monica | USA | Left | Left | 5' 9" | 185 lbs | $5,400,000 |
| Jones, Steve | C | Houston Armadillos | 38 | 01/17/1998 | Woodridge | USA | Right | Right | 6' 0" | 200 lbs | $880,000 |
| Jong, Mao-you | C | Free Agent | 19 | 02/08/2017 | Taipei | TPE | Right | Right | 5' 10" | 180 lbs | - |
| Jouda, Atsumori | SP | Toronto Beavers | 18 | 06/20/2018 | Nagoya | JPN | Left | Left | 6' 4" | 185 lbs | - |
| Juárez, José | SP | Atlanta Hurricanes | 16 | 12/14/2019 | Chiautzingo | MEX | Switch | Right | 6' 6" | 195 lbs | - |
