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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ubriani, Donkal | SP | San Francisco Earthquakes | 31 | 02/04/2001 | Unknown | IND | Right | Right | 5' 9" | 180 lbs | $12,000,000 |
| Uchida, Kawanari | RP | San Diego Hops | 27 | 09/23/2005 | Kamogawa | JPN | Right | Right | 6' 0" | 185 lbs | $550,000 |
| Uchida, Koryusai | SP | Free Agent | 30 | 04/02/2002 | Osaka | JPN | Right | Right | 6' 1" | 210 lbs | - |
| Uchiyama, Naizen | RP | Dallas Texans | 24 | 01/10/2008 | Kagoshima | JPN | Right | Right | 6' 2" | 195 lbs | $550,000 |
| Ugarte, Alex | SP | Rubber City Rhinos | 18 | 03/22/2014 | Yamasa | DOM | Right | Right | 6' 7" | 200 lbs | - |
| Ureta, Jonathan | 1B | San Diego Hops | 16 | 06/29/2016 | El Tigre | VEN | Right | Left | 6' 2" | 205 lbs | - |
| Uribe, Andres | SP | New York Mafia | 16 | 04/13/2016 | Havana | CUB | Right | Right | 6' 9" | 210 lbs | - |
| Uribe, Tony | SS | Portland Beavers | 18 | 09/10/2014 | Cataño | PUR | Right | Right | 6' 1" | 180 lbs | - |
| Uribe, Tony | C | Portland Beavers | 18 | 06/22/2014 | Sébaco | NCA | Switch | Right | 5' 11" | 185 lbs | - |
| Urrutia, Juan | 3B | South Carolina Bombers | 18 | 06/06/2014 | Estelí | NCA | Right | Right | 5' 11" | 170 lbs | - |
| Useche, Orlando | RF | Havana Stogies | 19 | 12/03/2013 | Monterrey | MEX | Right | Right | 5' 10" | 180 lbs | - |
