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| J |
| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| Jackson, Edward | CF | Portland Sea Dogs | 20 | 07/10/1990 | West Ocean City | USA | Right | Right | 6' 4" | 155 lbs | - |
| Jackson, Jake | SP | Richmond Flying Squirrels | 27 | 01/26/1983 | Jersey City | USA | Right | Right | 6' 0" | 210 lbs | - |
| Jackson, Larry | MR | Richmond Flying Squirrels | 28 | 10/11/1981 | MacPherson | USA | Left | Left | 6' 1" | 208 lbs | - |
| Jennings, Ron | SP | New Britain Rock Cats | 25 | 02/02/1985 | North Liberty | USA | Left | Left | 6' 0" | 200 lbs | - |
| Jensen, Ryan | SP | Harrisburg Senators | 28 | 07/13/1982 | Lima | USA | Right | Right | 6' 2" | 212 lbs | - |
| Jiang, Li-ben | LF | Altoona Curve | 18 | 10/16/1991 | Tsaotun | TPE | Right | Right | 6' 2" | 210 lbs | - |
| Jiménez, Sergio | RF | Trenton Thunder | 27 | 07/15/1983 | Queens | USA | Left | Left | 6' 0" | 224 lbs | - |
| Jones, Gregg | LF | Harrisburg Senators | 27 | 07/30/1983 | Lowell | USA | Switch | Right | 6' 0" | 215 lbs | - |
| Jones, Mark | CF | Binghamton Mets | 25 | 06/25/1985 | Colorado Springs | USA | Left | Left | 6' 0" | 190 lbs | - |
