John Isner, of the United States, rests between sets during a match against Donald Young, of the United States, at the Sony Open tennis tournament, Saturday, March 22, 2014, in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)
Donald Young reacts to missing a return by Denis Kudla 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)
Denis Kudla hits a return to Donald Young 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)
Tennis Hall-of-Famer Rod Laver, who won 11 Grand Slam titles and 200 tournaments, shakes hands with Britain's Andy Murray prior to flipping the coin for Murray's Davis Cup match against Donald Young, of the United States, Friday, Jan. 31, 2014, in San Diego. (AP Photo/Lenny Ignelzi)
Britain's Andy Murray slams a backhand shot in his 6-1, 6-2, 6-3 victory over Donald Young in a Davis Cup tennis match on Friday, Jan. 31, 2014, in San Diego. (AP Photo/Lenny Ignelzi)