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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Jonathan | C | Mahoning Valley Jockeys | 23 | 02/18/2000 | Robinson | USA | Switch | Right | 6' 0" | 205 lbs | - |
| Jennings, Chris | SS | Vermont Mountaineers | 23 | 10/17/2000 | Highlands Ranch | USA | Right | Right | 6' 0" | 185 lbs | - |
| Jiménez, Javier | 3B | Williamsport Battlecats | 23 | 09/02/2000 | Des Moines | USA | Right | Right | 6' 3" | 210 lbs | - |
| Jiménez, Ricardo | RP | Mahoning Valley Jockeys | 23 | 11/22/2000 | Binghamton | USA | Right | Right | 6' 2" | 205 lbs | - |
| Johnson, Wayne | SP | Tri-City Insects | 20 | 03/19/2003 | Oakland | USA | Left | Left | 6' 1" | 180 lbs | - |
| Johnston, Dale | 2B | Williamsport Battlecats | 24 | 03/19/1999 | Burbank | USA | Right | Right | 5' 10" | 185 lbs | - |
| Johnston, Jeremiah | 3B | Staten Island Eagles | 23 | 08/17/2000 | Cape Girardeau | USA | Right | Right | 6' 1" | 190 lbs | - |
| Johnston, John | SS | Vermont Mountaineers | 23 | 01/28/2000 | Lubbock | USA | Right | Right | 6' 0" | 185 lbs | - |
| Johnstone, Jonathon | RP | Hudson Valley Dukes | 22 | 03/08/2001 | Altadena | USA | Left | Left | 6' 7" | 210 lbs | - |
| Jones, Chris | RP | Brooklyn Unforgiven | 24 | 01/28/1999 | New York | USA | Right | Right | 6' 0" | 190 lbs | - |
| Jones, Kevin | RP | Hudson Valley Dukes | 22 | 11/09/2001 | Washington | USA | Right | Right | 6' 5" | 200 lbs | - |
| Joseph, Clyde | RP | Williamsport Battlecats | 24 | 05/04/1999 | Richmond West | USA | Right | Right | 6' 2" | 200 lbs | - |
| Juárez, Víctor | CF | Oneonta Warriors | 21 | 01/11/2002 | Camagüey | CUB | Left | Left | 6' 2" | 185 lbs | - |
