Andy Murray, of Great Britain, serves to Jiri Vesely, of Czech Republic, during a third round match at the BNP Paribas Open tennis tournament, Monday, March 10, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Jiri Vesely, of Czech Republic, returns a volley from Andy Murray, of Great Britain, during a third round match at the BNP Paribas Open tennis tournament, Monday, March 10, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Andy Murray, of Great Britain, returns a hit by Jiri Vesely, of Czech Republic, during a third round match at the BNP Paribas Open tennis tournament, Monday, March 10, 2014, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Jiri Vesely, of the Czech Republic, watches his return to Jack Sock, of the United States, at the U.S. National Indoor Tennis Championships on Wednesday, Feb. 12, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)
Jack Sock reaches to hit a return to Jiri Vesely, of Czech Republic, in the second round match at the U.S. National Indoor Tennis Championships on Wednesday, Feb. 12, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)
Jack Sock watches his return to Jiri Vesely, of Czech Republic, in the second round match at the U.S. National Indoor Tennis Championships on Wednesday, Feb. 12, 2014, in Memphis, Tenn. (AP Photo/Rogelio V. Solis)