Feliciano Lopez, of Spain, celebrates after beating Jack Sock, of the United States, in a quarterfinal at the U.S. National Indoor Championships tennis tournament Friday, Feb. 22, 2013, in Memphis, ... more 

Feliciano Lopez, of Spain, celebrates after beating Jack Sock, of the United States, in a quarterfinal at the U.S. National Indoor Championships tennis tournament Friday, Feb. 22, 2013, in Memphis, Tenn. Lopez won 6-4, 6-3. (AP Photo/Mark Humphrey) less