| 12/31/2018 | ||||||
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| J |
| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
| Jaconelli, Reginaldo | C | Otsego Bulldogs | 24 | 07/27/1994 | Coro | VEN | Right | Right | 6' 0" | 215 lbs | - |
| Jaramillo, Jesús | SP | Free Agent | 30 | 04/20/1988 | Santo Domingo | DOM | Left | Right | 6' 1" | 207 lbs | - |
| Jenkins, Chris | MR | Topeka Tornados | 31 | 07/08/1987 | Fontana | USA | Right | Right | 6' 4" | 201 lbs | - |
| Jiménez, Juan | 3B | Indiana Hounds | 22 | 12/07/1996 | Camagüey | CUB | Right | Right | 6' 2" | 195 lbs | - |
| Johnson, Gerald | CL | Tuscaloosa Trout Slayers | 23 | 11/30/1995 | Spring Hill | USA | Right | Left | 6' 2" | 205 lbs | - |
| Johnston, Hamilton | LF | Otsego Bulldogs | 32 | 06/25/1986 | Charles City | USA | Left | Left | 6' 0" | 188 lbs | - |
| Johnston, Thomas | RF | Otsego Bulldogs | 33 | 11/28/1985 | Austin | USA | Left | Left | 6' 0" | 221 lbs | - |
| Jones, Glen | SP | Charlotte Jackals | 26 | 08/07/1992 | Chicago | USA | Left | Left | 6' 2" | 195 lbs | - |
| Jones, Joey | LF | Topeka Tornados | 24 | 02/02/1994 | Abilene | USA | Left | Left | 6' 1" | 200 lbs | - |
| Jones, Lee | MR | Portland Privateers | 30 | 10/04/1988 | Parkville | USA | Switch | Right | 6' 4" | 225 lbs | - |
| Jones, Nathan | MR | Trenton Stars | 33 | 08/03/1985 | North Valley | USA | Right | Right | 5' 11" | 187 lbs | - |
