| Player | POS | Team | NUM | Height | Weight | DOB |
|---|---|---|---|---|---|---|
| Underwood Jr., Duane | SP | PIT | 56 | 6'2" | 210 lbs | Jul 20, 1994 |
| Upton, Justin | LF | LAA | 10 | 6'1" | 215 lbs | Aug 25, 1987 |
| Urena, Jose | SP | DET | 62 | 6'2" | 208 lbs | Sep 12, 1991 |
| Urias, Julio | SP | LAD | 7 | 6'0" | 225 lbs | Aug 12, 1996 |
| Urias, Luis | 2B | MIL | 2 | 5'9" | 186 lbs | Jun 3, 1997 |
| Urias, Ramon | SS | BAL | 29 | 5'11" | 180 lbs | Jun 3, 1994 |
| Urquidy, Jose | SP | HOU | 65 | 6'0" | 217 lbs | May 1, 1995 |
| Urshela, Gio | 3B | NYY | 29 | 6'0" | 215 lbs | Oct 11, 1991 |
