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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jae-Wook, Ryung | C | Casper Ghosts | 24 | 04/13/2014 | Seoul | KOR | Right | Right | 6' 4" | 220 lbs | - |
| James, Kenny | RP | Belvedere Park Rawhides | 24 | 06/29/2014 | Aurora | USA | Left | Left | 6' 4" | 200 lbs | - |
| Japón, Jorge | 3B | Marquette Miners | 22 | 12/17/2016 | Caracas | VEN | Right | Right | 6' 2" | 200 lbs | - |
| Jaramillo, Alberto | RP | Billings Polar Bears | 24 | 02/24/2014 | Providence | USA | Right | Left | 6' 1" | 195 lbs | - |
| Jasso, Mauro | CF | Belvedere Park Rawhides | 20 | 04/04/2018 | Havana | CUB | Right | Right | 6' 1" | 170 lbs | - |
| Jia, Tak-wai | C | Richland Rails | 24 | 08/30/2014 | Hsinchu | TPE | Right | Right | 6' 4" | 215 lbs | $280,000 |
| Jianbua, Dong-hua | 2B | San Antonio BC | 26 | 08/17/2012 | Sanhsia | TPE | Switch | Right | 6' 1" | 200 lbs | - |
| Johnson, Gary | RP | Casper Ghosts | 27 | 08/09/2011 | Erie | USA | Left | Right | 5' 11" | 195 lbs | - |
| Johnston, Sam | SP | Athletic Club KC Academy | 26 | 05/10/2012 | Danville | USA | Left | Left | 6' 2" | 210 lbs | - |
| Johnstone, Nate | SP | Billings Polar Bears | 24 | 04/29/2014 | Waukesha | USA | Left | Right | 6' 1" | 180 lbs | - |
| Jones, Vaughan | CL | Athletic Club KC Academy | 25 | 06/17/2013 | Henderson | USA | Right | Right | 5' 11" | 180 lbs | - |
| Jortikka, Manu | SP | Ottawa Nationals | 22 | 09/02/2016 | Zsombó | HUN | Right | Left | 6' 1" | 180 lbs | - |
| Jovellanos, Jose | SP | Richland Rails | 24 | 01/31/2014 | Nabua | PHI | Right | Right | 6' 8" | 220 lbs | - |
