| 12/31/2018 | ||||||
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| J |
| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| James, Mike | SP | San Jose Missions | 33 | 06/27/1985 | New York | USA | Right | Right | 6' 6" | 197 lbs | - |
| Jefferson, Dave | 2B | Free Agent | 33 | 01/29/1985 | Ludlow | USA | Switch | Right | 6' 1" | 199 lbs | - |
| Jiménez, Carlos | MR | Las Vegas Stars | 34 | 10/16/1984 | Estación Juanita | MEX | Left | Left | 6' 0" | 197 lbs | - |
| Jiménez, Gustavo | SP | Calgary Cowboys | 31 | 08/04/1987 | Managua | NCA | Switch | Right | 6' 0" | 202 lbs | - |
| Jiménez, Manuel | MR | Redwood City Redwoods | 33 | 12/21/1985 | Pimentel | DOM | Right | Right | 6' 2" | 205 lbs | - |
| Johnson, Eric | 2B | Albuquerque Isotopes | 24 | 01/30/1994 | The Bronx | USA | Right | Right | 6' 0" | 195 lbs | - |
| Johnson, Michael | LF | San Jose Missions | 30 | 02/08/1988 | Albuquerque | USA | Left | Left | 6' 2" | 221 lbs | - |
| Jones, Anthony | CL | San Jose Missions | 30 | 04/30/1988 | Scranton | USA | Right | Right | 6' 8" | 219 lbs | - |
| Jones, Jake | SP | Spokane Trappers | 29 | 08/26/1989 | Fresno | USA | Right | Right | 6' 1" | 171 lbs | - |
| Jones, Shannon | C | Lansing Lugnuts | 30 | 05/01/1988 | Manchester | USA | Right | Right | 6' 0" | 222 lbs | - |
| Jouda, Mitsunari | MR | Calgary Cowboys | 22 | 03/04/1996 | Niigata | JPN | Left | Right | 5' 7" | 220 lbs | - |
