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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Uda, Ed | SP | Free Agent | 20 | 05/25/2005 | Killeen | USA | Right | Right | 6' 5" | 195 lbs | - |
| Underwood, Ed | 2B | Free Agent | 16 | 06/08/2009 | Carson City | USA | Right | Right | 6' 2" | 180 lbs | - |
| Underwood, Jamal | 1B | San Diego Padres | 29 | 12/11/1996 | Auburn | USA | Left | Left | 6' 0" | 200 lbs | $10,132,000 |
| Urbina, Julián | C | Seattle Mariners | 16 | 06/25/2009 | Santo Domingo | DOM | Right | Right | 5' 11" | 170 lbs | - |
| Urbina, Luis | SP | Chicago White Sox | 16 | 02/22/2010 | San Pedro de Macorís | DOM | Left | Left | 6' 0" | 170 lbs | - |
| Urbina, Luis | SS | Oakland Athletics | 19 | 11/20/2006 | Las Matas de Santa Cruz | DOM | Right | Right | 6' 1" | 180 lbs | - |
| Urena, Richard | 2B | Arizona Diamondbacks | 30 | 02/26/1996 | San Francisco de Macorís | DOM | Left | Right | 6' 1" | 185 lbs | $17,000,000 |
| Urias, Julio | SP | San Diego Padres | 29 | 08/12/1996 | Unknown | MEX | Left | Left | 5' 11" | 185 lbs | $18,000,000 |
| Uribe, Jorge | SP | Miami Marlins | 16 | 12/10/2009 | Santo Domingo | DOM | Right | Right | 6' 1" | 180 lbs | - |
