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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jackson, Ramon | SP | Minnesota Twins | 25 | 08/03/2003 | Los Alamos | USA | Right | Right | 5' 10" | 195 lbs | $750,000 |
| Jackson, Zach | RP | Free Agent | 34 | 12/25/1994 | Tulsa | USA | Right | Right | 6' 4" | 205 lbs | - |
| Jacobsen, Mike | RP | Free Agent | 15 | 08/09/2013 | Eldridge | USA | Switch | Right | 6' 3" | 180 lbs | - |
| James, Andrew | CL | Philadelphia Phillies | 29 | 04/02/2000 | Haverhill | USA | Left | Left | 6' 2" | 200 lbs | $29,500,000 |
| James, Josh | SP | Free Agent | 15 | 10/17/2013 | Manchester | USA | Right | Right | 6' 5" | 180 lbs | - |
| Jansen, Danny | C | San Diego Padres | 34 | 04/15/1995 | Appleton | USA | Right | Right | 6' 2" | 225 lbs | $15,600,000 |
| Jaramillo, Luis | CF | San Francisco Giants | 18 | 12/04/2010 | Yauco | PUR | Switch | Left | 6' 4" | 190 lbs | - |
| Jefferson, Ron | C | Free Agent | 17 | 07/04/2012 | Strongsville | USA | Left | Right | 6' 1" | 190 lbs | - |
| Jeffes, Quintin | SP | Cleveland Guardians | 19 | 09/30/2009 | Melbourne | AUS | Right | Right | 6' 7" | 195 lbs | - |
| Jenkins, Andrew | RP | Cincinnati Reds | 28 | 11/03/2000 | Atlanta | USA | Right | Right | 6' 0" | 200 lbs | $2,350,000 |
| Jenkins, Chad | RF | Free Agent | 20 | 12/09/2008 | Ft. Worth | USA | Right | Right | 6' 0" | 195 lbs | - |
| Jervick, Johann | RP | St. Louis Cardinals | 26 | 03/28/2003 | Hamburg | GER | Right | Right | 5' 11" | 185 lbs | $750,000 |
| Jimenez, Eloy | LF | Toronto Blue Jays | 32 | 11/27/1996 | Santo Domingo | DOM | Right | Right | 6' 4" | 200 lbs | $750,000 |
| Jimenez, Joe | CL | Detroit Tigers | 34 | 01/17/1995 | Bayamón | PUR | Right | Right | 6' 3" | 260 lbs | $7,600,000 |
| Jimm, Qui-Gon | SP | Los Angeles Angels | 22 | 08/18/2006 | Tokyo | JPN | Left | Left | 6' 4" | 200 lbs | $750,000 |
| Jobe, Jackson | SP | Free Agent | 18 | 07/30/2010 | Irving | USA | Right | Right | 6' 2" | 190 lbs | - |
| Joe, Whiskey | RF | Texas Rangers | 18 | 03/15/2011 | Galway | IRL | Left | Left | 6' 4" | 220 lbs | - |
| Johes, Thierno | CF | Free Agent | 16 | 10/14/2012 | Clifton Park | USA | Right | Right | 6' 2" | 170 lbs | - |
| John, Bubba | SP | Cincinnati Reds | 17 | 09/10/2011 | Plymouth | USA | Switch | Right | 6' 0" | 170 lbs | - |
| Johnson, Danny | SP | Minnesota Twins | 24 | 11/06/2004 | Chelsea | USA | Right | Right | 5' 11" | 200 lbs | $750,000 |
| Johnson, Dwayne | 2B | New York Mets | 24 | 05/02/2005 | Hayward | USA | Right | Right | 6' 5" | 245 lbs | $750,000 |
| Johnson, Tyler B. | RP | San Diego Padres | 33 | 08/21/1995 | Richmond | USA | Right | Right | 6' 3" | 205 lbs | $8,000,000 |
| Jolin, Ethan | 2B | Free Agent | 18 | 06/09/2011 | Cleveland | USA | Right | Right | 6' 0" | 175 lbs | - |
| Jones, Al | C | Chicago Cubs | 28 | 10/23/2000 | Queensbury | USA | Switch | Right | 6' 3" | 200 lbs | $750,000 |
| Jones, Dave | CL | Montreal Expos | 24 | 10/01/2004 | Pleasant Grove | USA | Right | Right | 6' 2" | 210 lbs | $750,000 |
| Jones, Jahmai | LF | New York Mets | 31 | 08/04/1997 | Roswell | USA | Right | Right | 6' 0" | 210 lbs | $7,500,000 |
| Jones, Sajoun | 2B | Atlanta Braves | 18 | 11/30/2010 | Hillsboro | USA | Left | Right | 6' 1" | 180 lbs | - |
| Joo, Hyo-sang | C | Boston Red Sox | 31 | 11/11/1997 | Unknown | KOR | Left | Right | 5' 11" | 195 lbs | $5,500,000 |
| Judge, Aaron | RF | Cleveland Guardians | 37 | 04/26/1992 | Linden | USA | Right | Right | 6' 7" | 260 lbs | $36,420,069 |
| Julian, Joey | RF | Free Agent | 19 | 07/23/2010 | Middletown | USA | Left | Left | 6' 1" | 175 lbs | - |
| Julien, Edouard | 2B | Boston Red Sox | 20 | 04/30/2009 | Quebec City | CAN | Left | Right | 6' 0" | 195 lbs | - |
| Jung, Josh | 3B | Milwaukee Brewers | 31 | 02/12/1998 | San Antonio | USA | Right | Right | 6' 2" | 195 lbs | $16,000,000 |
| Justice, Brett | RP | Washington Nationals | 24 | 06/02/2005 | Ft. Worth | USA | Right | Right | 6' 2" | 200 lbs | $750,000 |
| Justo, Francisco | RP | San Francisco Giants | 30 | 12/20/1998 | New York | USA | Right | Right | 6' 4" | 200 lbs | $1,600,000 |
