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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jacobs, Josh | RP | Sudbury Blueberry Bulldogs | 26 | 07/01/2015 | Laurel | USA | Left | Left | 6' 0" | 200 lbs | $545,000 |
| Jacquez, Ramon | RP | St. Louis Archies | 33 | 10/14/2008 | Maracaibo | VEN | Right | Left | 6' 3" | 200 lbs | $1,500,000 |
| Jafaev, Grigorii | SS | New York Empire | 19 | 04/18/2022 | Krivoy Rog | UKR | Right | Right | 6' 1" | 180 lbs | - |
| Jahn, Jason | LF | Free Agent | 36 | 07/22/2005 | Los Angeles | USA | Right | Right | 5' 11" | 190 lbs | - |
| Jahn, Ted | SS | Buffalo Buffalo | 35 | 03/10/2006 | Peoria | USA | Right | Right | 6' 0" | 200 lbs | $13,200,000 |
| Jaramillo, Mario | CL | Buffalo Buffalo | 32 | 02/11/2010 | Havana | CUB | Right | Right | 6' 0" | 205 lbs | $10,000,000 |
| Jaramillo, Oscar | SS | Sudbury Blueberry Bulldogs | 32 | 10/06/2009 | La Chorrera | PAN | Left | Right | 6' 0" | 185 lbs | $12,100,000 |
| Jarman, Cody | LF | Free Agent | 33 | 11/23/2008 | Hopkins | USA | Switch | Right | 6' 9" | 200 lbs | - |
| Jauregui, Henry | RP | Saskatchewan 92's | 31 | 06/16/2010 | Chigorodó | COL | Switch | Right | 6' 4" | 200 lbs | $1,400,000 |
| Jesus, Gus | SS | St. Louis Archies | 16 | 02/25/2025 | Santa Teresa | VEN | Switch | Right | 6' 0" | 160 lbs | - |
| Jimenez, Carlos | LF | Lansing Red Storm | 25 | 02/12/2017 | San Carlos del Zulia | VEN | Left | Right | 5' 11" | 190 lbs | $545,000 |
| Johnson, Bobby | RP | Omaha Aces | 37 | 01/17/2005 | Olympia Heights | USA | Switch | Right | 6' 2" | 200 lbs | - |
| Johnson, Jabari | SS | Saskatchewan 92's | 32 | 08/17/2009 | Markham | CAN | Switch | Right | 5' 10" | 190 lbs | $6,000,000 |
| Johnson, Mike | RP | Buffalo Buffalo | 32 | 01/16/2010 | Whitmore Lake | USA | Right | Right | 6' 7" | 200 lbs | $1,095,450 |
| Jordan, Billy | CF | Brooklyn Knights | 28 | 01/05/2014 | Phoenix | USA | Left | Left | 6' 1" | 190 lbs | $545,000 |
| Juan, Frank | RP | Omaha Aces | 33 | 11/08/2008 | Willoughby Hills | USA | Right | Right | 6' 5" | 200 lbs | $880,000 |
| Juarez, Danny | C | Memphis Chicks | 28 | 10/23/2013 | Santa Teresa | VEN | Right | Right | 6' 2" | 205 lbs | $545,000 |
