Guido Pella, of Argentina, returns to Jack Sock, of the United States, during their match at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. Sock won 6-3, 6-4. (AP Photo/Alan Diaz)

Sony Open Tennis

Guido Pella, of Argentina, returns to Jack Sock, of the United States, during their match at the Sony Open tennis tournament in Key Biscayne, Fla., Thursday, March 20, 2014. Sock won 6-3, 6-4. (AP Photo/Alan Diaz)

Top Ranked Players
More Rankings