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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jaramillo, Jesús | SS | Long Island Seawolves | 26 | 07/01/2008 | Havana | CUB | Right | Right | 6' 2" | 205 lbs | - |
| Jarvi, Miika | SP | San Bernardino Grasshoppers | 24 | 01/17/2010 | Sopron | HUN | Switch | Right | 6' 2" | 200 lbs | - |
| Jensson, Adam | 2B | Little Caesars Hot N Readys | 22 | 04/23/2012 | Vantaa | FIN | Right | Right | 6' 2" | 180 lbs | - |
| Jimínez, Juan | LF | Irving Blue Sox | 26 | 03/01/2008 | Town 'n' Country | USA | Left | Left | 6' 0" | 215 lbs | - |
| Johnson, Mike | SS | Free Agent | 29 | 07/13/2005 | Wright | USA | Right | Right | 6' 1" | 215 lbs | - |
| Juckson, T.J. | RP | Northville Eclipse | 22 | 07/25/2012 | Córdoba | MEX | Right | Right | 6' 1" | 200 lbs | - |
| Júlio, Fernando | RP | Free Agent | 29 | 09/06/2005 | Caracas | VEN | Left | Right | 6' 1" | 195 lbs | - |
| Justiniano, Júlio | SP | San Bernardino Grasshoppers | 24 | 07/09/2010 | Puerto Escondido | MEX | Right | Right | 6' 0" | 195 lbs | - |
| Jusufi, Behar | RP | Free Agent | 27 | 07/02/2007 | Tirana | ALB | Switch | Right | 6' 1" | 190 lbs | - |
