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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ubriani, Donkal | RP | Oklahoma City Prowlers | 33 | 02/04/2001 | Unknown | IND | Right | Right | 5' 9" | 180 lbs | $16,970,000 |
| Uchida, Kawanari | RP | San Diego Hops | 29 | 09/23/2005 | Kamogawa | JPN | Right | Right | 6' 0" | 190 lbs | $550,000 |
| Uchida, Koryusai | RP | Free Agent | 32 | 04/02/2002 | Osaka | JPN | Right | Right | 6' 1" | 205 lbs | - |
| Uchiyama, Naizen | RP | Las Vegas Aces | 26 | 01/10/2008 | Kagoshima | JPN | Right | Right | 6' 2" | 195 lbs | $550,000 |
| Ueno, Hidero | SP | Free Agent | 18 | 09/15/2016 | Nishitōkyō | JPN | Left | Right | 6' 3" | 190 lbs | - |
| Ugarte, Tony | C | Seattle Sasquatch | 18 | 04/23/2016 | Panama | PAN | Right | Right | 6' 4" | 215 lbs | - |
| Urban, Mark | 3B | Free Agent | 28 | 06/05/2006 | Bristol | USA | Left | Right | 6' 0" | 205 lbs | - |
| Urbina, Danny | 1B | South Carolina Bombers | 17 | 09/20/2017 | Montemorelos | MEX | Right | Right | 6' 3" | 205 lbs | - |
| Ureta, Jonathan | 1B | San Diego Hops | 18 | 06/29/2016 | El Tigre | VEN | Right | Left | 6' 2" | 205 lbs | - |
| Uribe, Andres | RP | Free Agent | 18 | 04/13/2016 | Havana | CUB | Right | Right | 6' 9" | 210 lbs | - |
| Uribe, Tony | SS | Free Agent | 20 | 09/10/2014 | Cataņo | PUR | Right | Right | 6' 1" | 180 lbs | - |
| Urquia, Luis | C | San Diego Hops | 18 | 06/21/2016 | Sabana Larga | DOM | Left | Right | 6' 0" | 185 lbs | - |
| Urrutia, Alex | SP | Quebec Armada | 17 | 02/21/2017 | Liberia | CRC | Switch | Right | 6' 5" | 185 lbs | - |
| Ushijima, Hiyutaro | C | Bloomington Blazers | 24 | 02/18/2010 | Kyoto | JPN | Right | Right | 6' 0" | 205 lbs | $550,000 |
