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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Matt | 3B | Washington Warriors | 26 | 12/22/1999 | Omaha | USA | Right | Right | 6' 2" | 195 lbs | $100,000 |
| Jackson, Matt | 2B | Denver Cutthroats | 30 | 01/16/1995 | Blaine | USA | Right | Right | 6' 1" | 195 lbs | $1,000,000 |
| Jacobs, Bryce | SP | Los Angeles Knights | 27 | 12/16/1998 | The Woodlands | USA | Right | Right | 6' 2" | 195 lbs | $100,000 |
| Jacobs, Matt | RP | Free Agent | 31 | 01/02/1994 | Washington | USA | Right | Right | 6' 4" | 205 lbs | - |
| Jacquez, Jose | C | Free Agent | 32 | 11/30/1993 | El Limón | VEN | Right | Right | 6' 0" | 205 lbs | - |
| Jang, Sung-jin | 3B | Minnesota Loons | 25 | 12/20/2000 | Seoul | KOR | Switch | Right | 6' 2" | 215 lbs | $100,000 |
| Jansen, Gart | SP | Free Agent | 33 | 07/02/1992 | Hoorn | NED | Right | Right | 6' 2" | 200 lbs | - |
| Jansen, Martin | SP | Chicago Union | 17 | 04/01/2008 | Katwijk | NED | Right | Right | 6' 4" | 190 lbs | - |
| Jaquez, Efrain | 1B | Tampa Bay Thunder | 16 | 02/08/2009 | Cúa | VEN | Right | Right | 6' 8" | 240 lbs | - |
| Jimenez, Emmanuel | SS | Nashville Bluebirds | 17 | 04/18/2008 | Maturín | VEN | Right | Right | 6' 2" | 175 lbs | - |
| Jimenez, Gustavo | CF | New York City Gothams | 16 | 01/28/2009 | Santo Domingo | DOM | Right | Right | 6' 1" | 175 lbs | - |
| Johnson, Bill | SS | Minnesota Loons | 29 | 10/01/1996 | Kingfisher | USA | Right | Right | 6' 0" | 200 lbs | $100,000 |
| Johnson, Isaiah | RP | Miami Sun Sox | 26 | 10/13/1999 | Port Huron | USA | Right | Right | 6' 2" | 185 lbs | $100,000 |
| Johnson, John | SP | El Paso Diablos | 26 | 05/22/1999 | Grantley | USA | Left | Left | 6' 4" | 200 lbs | $100,000 |
| Johnson, Jon | RP | San Francisco Peanuts | 29 | 01/09/1996 | Borrego Springs | USA | Right | Right | 6' 1" | 200 lbs | $232,000 |
| Johnson, Josh | C | Seattle Gulls | 23 | 01/29/2002 | New York | USA | Right | Right | 6' 0" | 190 lbs | - |
| Jones, Jaden | C | Seattle Gulls | 30 | 10/26/1995 | Elsmere | USA | Left | Right | 6' 3" | 205 lbs | $100,000 |
| Jones, Jeremiah | RP | Arizona Suns | 24 | 04/29/2001 | Columbus | USA | Right | Right | 5' 10" | 180 lbs | - |
| Jones, Kaiden | RP | Philadelphia Keystones | 27 | 09/29/1998 | Merrillville | USA | Right | Right | 5' 10" | 185 lbs | $100,000 |
| Jones, Paul | 1B | Arizona Suns | 27 | 02/05/1998 | Perryville | USA | Left | Left | 6' 2" | 220 lbs | $100,000 |
| Jones, Xavier | LF | Denver Cutthroats | 27 | 10/15/1998 | Thornton | USA | Left | Left | 6' 3" | 215 lbs | $100,000 |
| Juarez, David | LF | Detroit Motors | 25 | 07/15/2000 | Cali | COL | Switch | Right | 6' 2" | 195 lbs | $100,000 |
| Juarez, Gilberto | SS | Philadelphia Keystones | 16 | 06/11/2009 | Cabrera | DOM | Right | Right | 6' 2" | 175 lbs | - |
| Jung, Ki-tae | SP | Philadelphia Keystones | 29 | 05/31/1996 | Hwasun | KOR | Left | Right | 6' 3" | 185 lbs | $1,750,000 |
| Jusino, Eddie | 3B | Philadelphia Keystones | 19 | 12/10/2006 | Bayamo | CUB | Switch | Right | 6' 4" | 205 lbs | - |
