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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jacoby, Axel | RP | Chandler Waxers | 24 | 06/30/2015 | Toowoomba | AUS | Right | Right | 6' 4" | 200 lbs | - |
| Jaramillo, Ignacio | 1B | Eindhoven Electric | 22 | 06/17/2017 | Memphis | USA | Left | Right | 6' 0" | 185 lbs | - |
| Jenkins, Aaron | RF | Eindhoven Electric | 29 | 11/04/2010 | Bloomington | USA | Left | Left | 6' 3" | 200 lbs | - |
| Jenkins, Bill | LF | Newport News Anchormen | 25 | 01/22/2015 | Eldora | USA | Right | Right | 6' 4" | 200 lbs | $560,000 |
| Jenkins, Jeff | CF | Free Agent | 27 | 03/13/2013 | Fresno | USA | Left | Left | 6' 2" | 195 lbs | - |
| Jia, Decheng | SS | Yokohama Plumbers | 29 | 08/25/2010 | Shulin | TPE | Left | Right | 6' 1" | 170 lbs | - |
| Jiménez, José | C | Lincoln Emancipation | 24 | 07/06/2015 | Buenos Aires | ARG | Right | Right | 6' 1" | 200 lbs | - |
| Jing, Jue | SS | Aberdeen Golden Sands | 33 | 01/17/2007 | Tianjin | CHN | Right | Right | 6' 3" | 195 lbs | - |
| Jiu, I-po | LF | Akron Ambers | 24 | 12/16/2015 | Hsichih | TPE | Left | Right | 6' 0" | 200 lbs | - |
| Jiu, Jing-quo | SP | Aberdeen Golden Sands | 24 | 05/04/2015 | Taiyuan | CHN | Switch | Right | 6' 5" | 195 lbs | $560,000 |
| Johnston, Stephen | RP | Yokohama Plumbers | 25 | 04/29/2015 | Dearborn Heights | USA | Left | Left | 6' 4" | 200 lbs | - |
| Johnstone, Kyle | RP | Clifton Dons | 29 | 01/14/2011 | Clarkston | SCO | Right | Right | 6' 2" | 200 lbs | - |
| Jones, Mal | SP | Niigata Gigans | 23 | 05/19/2016 | Palmer | USA | Right | Right | 6' 8" | 205 lbs | - |
| Jones, Rich | RP | Grand Rapids Rafters | 30 | 10/24/2009 | Manhattan | USA | Switch | Right | 6' 3" | 200 lbs | - |
| Jones, Taj | RP | Kyoto Rodan | 29 | 11/19/2010 | Cleveland | USA | Right | Right | 6' 3" | 180 lbs | - |
| Joo, Lu-shan | SP | Free Agent | 25 | 01/16/2015 | Tucheng | TPE | Left | Left | 6' 2" | 185 lbs | - |
| Jordan, Isaac | RP | Niigata Gigans | 24 | 06/26/2015 | Chicago | USA | Right | Right | 5' 9" | 170 lbs | - |
| Joseph, Jake | LF | Clifton Dons | 32 | 04/04/2008 | Colorado Springs | USA | Left | Left | 6' 4" | 200 lbs | - |
| Jouda, Akinori | 3B | Henderson Fighting Scotts | 20 | 06/23/2019 | Sakai | JPN | Right | Right | 6' 4" | 175 lbs | - |
| Juárez, Carlos | 3B | Newport News Anchormen | 34 | 06/09/2005 | Zarzal | COL | Left | Right | 6' 0" | 200 lbs | - |
| Juárez, Vicente | SP | Iowa City Kingpins | 24 | 06/30/2015 | West Covina | USA | Left | Left | 6' 1" | 180 lbs | - |
