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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Nate | SP | Free Agent | 21 | 02/15/2009 | Saginaw | USA | Right | Right | 5' 10" | 180 lbs | - |
| James, Mike | 3B | Free Agent | 21 | 12/27/2009 | Rocklin | USA | Right | Right | 6' 2" | 215 lbs | - |
| Jameson, Corbin | RP | Atlanta Smoke | 24 | 04/21/2006 | Unknown | SCO | Left | Left | 5' 8" | 160 lbs | $1,050,000 |
| Jaramillo, Ángel | SP | Free Agent | 22 | 06/01/2008 | Lake Elsinore | USA | Switch | Right | 6' 3" | 210 lbs | - |
| Jarca, José | 2B | Vancouver Grey Wolves | 24 | 10/08/2006 | Villa Jaragua | DOM | Right | Right | 6' 2" | 200 lbs | $280,000 |
| Jensson, Adam | SS | Detroit Renaissance | 18 | 04/23/2012 | Vantaa | FIN | Right | Right | 6' 2" | 165 lbs | - |
| Jewell, Ron | SP | Free Agent | 18 | 12/31/2012 | Chicago | USA | Right | Right | 6' 4" | 190 lbs | - |
| Jian, Ju-wei | SP | Free Agent | 20 | 08/20/2010 | Athens | USA | Right | Left | 6' 3" | 190 lbs | - |
| Jianbua, Dong-hua | 2B | Atlanta Smoke | 18 | 08/17/2012 | Sanhsia | TPE | Switch | Right | 6' 0" | 185 lbs | - |
| Jiménez, Dallas | SS | Free Agent | 21 | 11/04/2009 | North Atlanta | USA | Right | Right | 6' 1" | 190 lbs | - |
| Jiménez, Esteban | RP | Chicago Gold Sox | 24 | 11/30/2006 | Guanajuato | MEX | Left | Left | 6' 2" | 185 lbs | $280,000 |
| Jing, Ji | SP | D.C. Divided | 26 | 05/17/2004 | Unknown | CHN | Right | Right | 6' 0" | 185 lbs | $480,000 |
| John, Terry | 2B | Free Agent | 17 | 02/23/2013 | National City | USA | Right | Right | 5' 10" | 160 lbs | - |
| Johnson, Keith | RP | Free Agent | 19 | 02/05/2011 | Omaha | USA | Right | Right | 5' 10" | 170 lbs | - |
| Johnston, Doug | C | Free Agent | 18 | 04/22/2012 | San Antonio | USA | Right | Right | 6' 0" | 190 lbs | - |
| Jones, Joey | RF | Richardson City Thundercats | 35 | 02/13/1995 | Evergreen | USA | Right | Right | 6' 1" | 210 lbs | $800,000 |
| Jones, Nate | SP | Free Agent | 18 | 01/17/2012 | San Jose | USA | Right | Right | 6' 3" | 190 lbs | - |
| Jones, Tommy | RF | Panama City Piranhas | 37 | 10/31/1993 | Reno | USA | Right | Right | 6' 0" | 195 lbs | $15,500,000 |
| Joseph, Mimosa | SP | Northern Virginia Rainbow Mermaids | 31 | 03/19/1999 | St. Paul | USA | Right | Right | 6' 0" | 215 lbs | $4,810,000 |
| Joyner, Jack | SP | Free Agent | 21 | 11/18/2009 | Columbus | USA | Right | Right | 6' 1" | 195 lbs | - |
| Joysey, Arlen | C | Vancouver Grey Wolves | 29 | 07/05/2001 | Los Angeles | USA | Right | Right | 6' 2" | 235 lbs | $3,300,000 |
