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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Jonathan | CL | Detroit Tigers | 24 | 08/16/2001 | Burnaby | CAN | Right | Right | 6' 4" | 210 lbs | $3,720,000 |
| Jackson, Leo | LF | Boston Red Sox | 16 | 11/19/2009 | Adelaide | AUS | Left | Left | 6' 4" | 195 lbs | - |
| Jackson, Pete | SP | Free Agent | 29 | 08/21/1996 | Springfield | USA | Right | Right | 6' 2" | 200 lbs | - |
| Jackson, Tom | RP | Houston Astros | 27 | 10/16/1998 | St. James | USA | Right | Right | 6' 0" | 195 lbs | $740,000 |
| Jacobs, Mark | RP | Milwaukee Brewers | 26 | 08/19/1999 | Lathrop | USA | Right | Right | 5' 11" | 195 lbs | - |
| Jacobs, Tim | RP | Milwaukee Brewers | 35 | 03/28/1991 | Warrington Township | USA | Right | Right | 5' 10" | 195 lbs | $1,800,000 |
| Jandreau, Ryan | RP | Milwaukee Brewers | 24 | 01/28/2002 | Scottsbluff | USA | Right | Right | 6' 1" | 200 lbs | - |
| Jasko, Pat | SP | St. Louis Cardinals | 25 | 01/31/2001 | Albuquerque | USA | Right | Right | 6' 2" | 210 lbs | $6,600,000 |
| Jaso, Saul | RP | Washington Nationals | 29 | 09/26/1996 | San Pedro de Macorís | DOM | Left | Left | 6' 1" | 195 lbs | $1,860,000 |
| Jauregui, Alex | RF | Los Angeles Angels | 36 | 01/23/1990 | San Pedro de Macorís | DOM | Left | Left | 6' 0" | 205 lbs | $1,820,000 |
| Jefferson, Tony | SS | Los Angeles Dodgers | 23 | 09/25/2002 | Wichita | USA | Right | Right | 6' 2" | 190 lbs | $740,000 |
| Jimenez, Bobby | SS | Lake Wylie Renegades | 27 | 07/11/1998 | Santo Domingo | DOM | Right | Right | 6' 0" | 175 lbs | $9,200,000 |
| Jimenez, Danny | SP | New York Yankees | 16 | 05/18/2009 | Villa de Cura | VEN | Right | Right | 6' 1" | 175 lbs | - |
| Jimenez, Luis | SS | Boston Red Sox | 22 | 08/22/2003 | Santo Domingo | DOM | Right | Right | 6' 0" | 185 lbs | $740,000 |
| Jimenez, Willie | SP | Detroit Tigers | 17 | 10/29/2008 | Altagracia de Orituco | VEN | Right | Right | 6' 3" | 185 lbs | - |
| Jiu, Huang-di | SP | Chicago Cubs | 32 | 03/02/1994 | Yilan | TPE | Right | Right | 6' 1" | 200 lbs | $27,400,000 |
| Johnson, Doug | RP | Free Agent | 26 | 09/14/1999 | Alamance | USA | Left | Left | 6' 0" | 195 lbs | - |
| Johnson, Elliot | RP | Milwaukee Brewers | 25 | 05/30/2000 | Indialantic | USA | Switch | Right | 6' 2" | 205 lbs | $740,000 |
| Johnson, Frank | 3B | New York Yankees | 26 | 07/09/1999 | Rowlett | USA | Right | Right | 6' 4" | 230 lbs | $7,000,000 |
| Johnson, Steve | SP | Texas Rangers | 31 | 11/03/1994 | Stowell | USA | Right | Right | 5' 10" | 190 lbs | $11,700,000 |
| Jones, Casey | SP | Free Agent | 29 | 02/16/1997 | Chesterfield | USA | Switch | Right | 6' 0" | 190 lbs | - |
| Jones, George | RP | Toronto Blue Jays | 28 | 10/29/1997 | Kokomo | USA | Left | Left | 6' 0" | 200 lbs | $1,260,000 |
| Jones, Rich | 3B | Athletics | 23 | 10/11/2002 | Saginaw | USA | Right | Right | 6' 0" | 195 lbs | $740,000 |
| Jones, Troy | C | Athletics | 20 | 12/15/2005 | Dallas | USA | Right | Right | 6' 0" | 200 lbs | - |
| Ju, Xin | 3B | St. Louis Cardinals | 28 | 01/11/1998 | Kaohsiung | TPE | Right | Right | 5' 11" | 190 lbs | $24,400,000 |
| Juarez, Angelo | C | Chicago White Sox | 27 | 03/12/1999 | Yaguate | DOM | Switch | Right | 6' 2" | 215 lbs | $740,000 |
| Juarez, Leo | 3B | Tampa Bay Rays | 23 | 10/05/2002 | Carora | VEN | Right | Right | 6' 0" | 210 lbs | $2,440,000 |
| Julius, Tim | LF | Tampa Bay Rays | 25 | 01/16/2001 | New York | USA | Switch | Right | 6' 2" | 210 lbs | $3,600,000 |
| Jurasek, Vratislav | SS | Toronto Blue Jays | 16 | 06/17/2009 | Nové Zamky | SVK | Right | Right | 6' 0" | 170 lbs | - |
| Justice, Mike | CF | Milwaukee Brewers | 27 | 03/10/1999 | Lincoln | USA | Right | Right | 6' 0" | 180 lbs | $740,000 |
