Andy Murray, of Great Britain, reacts during a break between sets after losing the first two sets to Stanislas Wawrinka, of Switzerland, during the quarterfinals of the 2013 U.S. Open tennis tournament, Thursday, Sept. 5, 2013, in New York. (AP Photo/David Goldman)

Photo by: David Goldman

Andy Murray, of Great Britain, reacts during a break between sets after losing the first two sets to Stanislas Wawrinka, of Switzerland, during the quarterfinals of the 2013 U.S. Open tennis tournament, Thursday, Sept. 5, 2013, in New York. (AP Photo/David Goldman)