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| J |
| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| Jacobs, Jamie | MR | Nashville Sounds | 22 | 02/10/1988 | San Juan | PUR | Left | Left | 6' 3" | 195 lbs | - |
| Jensen, Travis | LF | Sacramento River Cats | 26 | 05/15/1984 | Glendale | USA | Left | Right | 6' 1" | 195 lbs | - |
| Jiang, Po-sin | SP | Fresno Grizzlies | 32 | 10/23/1977 | Yancheng | CHN | Left | Right | 6' 4" | 232 lbs | - |
| Johnston, Irving | 3B | Portland Beavers | 24 | 03/15/1986 | Los Angeles | USA | Right | Right | 5' 10" | 195 lbs | - |
| Johnston, Kelly | 2B | Omaha Royals | 24 | 11/04/1985 | MacKinney | USA | Right | Right | 6' 2" | 195 lbs | - |
| Jones, George | SS | Colorado Springs Sky Sox | 21 | 11/18/1988 | Louisville | USA | Right | Right | 6' 0" | 210 lbs | - |
| Juárez, César | CL | Round Rock Express | 24 | 12/17/1985 | Havana | CUB | Right | Right | 6' 2" | 190 lbs | - |
| Júlio, Ramón | RF | Round Rock Express | 27 | 06/23/1983 | Carrollton | USA | Left | Left | 6' 0" | 215 lbs | - |
