Images from Thursday's action at the U.S. Open
Andy Murray of Britain serves to Stanislas Wawrinka of Switzerland at the U.S. Open tennis championships in New York September 5, 2013.ADAM HUNGER/Reuters
Venus, left, and Serena Williams of the U.S. during a women's doubles third-round match against Lucie Safarova, right, of the Czech Republic and Anastasia Pavlyuchenkova of Russia at the U.S. Open tennis tournament in New York, Sept. 4, 2013.BARTON SILVERMAN/The New York Times
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.David Goldman/The Associated Press
Stanislas Wawrinka of Switzerland hits a return to Andy Murray of Britain at the U.S. Open tennis championships in New York September 5, 2013.ADAM HUNGER/Reuters
Novak Djokovic, Serbia, reacts following a shot during a quarterfinal match against Mikhail Youzhny, Russia, at the 2013 U.S. Open tennis tournament, Thursday, Sept. 5, 2013, in New York.Darron Cummings/The Associated Press
Venus Williams, left, and Serena Williams react after a point against Sara Errani, of Italy, and Roberta Vinci, of Italy, during the women's doubles quarterfinals of the 2013 U.S. Open tennis tournament, Thursday, Sept. 5, 2013, in New York.Mike Groll/The Associated Press
Andy Murray, of Great Britain, follows through on a shot to Stanislas Wawrinka, of Switzerland, during the quarterfinals of the 2013 U.S. Open tennis tournament, Thursday, Sept. 5, 2013, in New York.David Goldman/The Associated Press
Novak Djokovic of Serbia returns a shot to Mikhail Youzhny of Russia during their quarter-final match at the U.S. Open tennis championships in New York, September 5, 2013.SHANNON STAPLETON/Reuters
Stanislas Warinka of Switzerland kicks and misses the ball during his match against Andy Murray of Britain at the U.S. Open tennis championships in New York September 5, 2013.ADAM HUNGER/Reuters
Venus Williams (R) and Serena Williams of the U.S. shake hands with Roberta Vinci (L) and Sara Errani of Italy after the Williams sisters won their doubles match at the U.S. Open tennis championships in New York September 5, 2013.EDUARDO MUNOZ/Reuters
Stanislas Wawrinka, of Switzerland, returns a shot to Andy Murray, of Great Britain, during the quarterfinals of the 2013 U.S. Open tennis tournament, Thursday, Sept. 5, 2013, in New York.David Goldman/The Associated Press
Andy Murray of Britain hits a return to Stanislas Wawrinka of Switzerland at the U.S. Open tennis championships in New York September 5, 2013.EDUARDO MUNOZ/Reuters
Stanislas Wawrinka of Switzerland serves to Andy Murray of Britain at the U.S. Open tennis championships in New York September 5, 2013.MIKE SEGAR/Reuters
Andy Murray of Britain chases down a return to Stanislas Wawrinka of Switzerland at the U.S. Open tennis championships in New York September 5, 2013.EDUARDO MUNOZ/Reuters
Venus Williams (L) and Serena Williams of the U.S. return to Roberta Vinci and Sara Errani of Italy in their doubles match at the U.S. Open tennis championships in New York September 5, 2013.EDUARDO MUNOZ/Reuters
Andy Murray of Britain reacts and breaks his racquet while playing Stanislas Wawrinka of Switzerland at the U.S. Open tennis championships in New York September 5, 2013.EDUARDO MUNOZ/Reuters
Stanislas Wawrinka of Switzerland celebrates a point against Andy Murray of Britain at the U.S. Open tennis championships in New York September 5, 2013.GARY HERSHORN/Reuters
Leander Paes (L) of India and Radek Stepanek of the Czech Republic celebrate winning match point against Bob and Mike Bryan of the U.S. in their men's doubles match at the U.S. Open tennis championships in New York September 5, 2013.GARY HERSHORN/Reuters
Leander Paes, left, of India and Radek Stepanek of the Czech Republic during heir men's doubles semifinal match against Bob and Mike Bryan of the U.S. at Arthur Ashe Stadium during the U.S. Open tennis tournament in New York, Sept. 5, 2013.ULI SEIT/The New York Times
Andy Murray, of Britain, returns a shot to Stanislas Wawrinka, of Switzerland, during the quarterfinals of the 2013 U.S. Open tennis tournament, Thursday, Sept. 5, 2013, in New York.David Goldman/The Associated Press
Novak Djokovic of Serbia returns a volley to Mikhail Youzhny of Russia during their quarter-final match at the U.S. Open tennis championships in New York September 5, 2013.MIKE SEGAR/Reuters
Leander Paes, of India, turns and reacts to his partner Radek Stepanek, of the Czech Republic, during the men's doubles quarterfinals against Mike and Bob Bryan at the 2013 U.S. Open tennis tournament, Thursday, Sept. 5, 2013, in New York.David Goldman/The Associated Press
Andy Murray, of Great Britain, steps back into the linesman as he returns a shot to Stanislas Wawrinka, of Switzerland, during the quarterfinals of the 2013 U.S. Open tennis tournament, Thursday, Sept. 5, 2013, in New York.Mike Groll/The Associated Press
Leander Paes (L) of India and Radek Stepanek of the Czech Republic return to Bob and Mike Bryan of the U.S. in their men's doubles match at the U.S. Open tennis championships in New York September 5, 2013.ADAM HUNGER/Reuters
Stanislas Wawrinka of Switzerland celebrates winning match point against Andy Murray of Britain at the U.S. Open tennis championships in New York September 5, 2013.GARY HERSHORN/Reuters
Andy Murray, of Great Britain, waves to the crowd as he walks off the court after losing to Stanislas Wawrinka, of Switzerland, during the quarterfinals of the 2013 U.S. Open tennis tournament, Thursday, Sept. 5, 2013, in New York.David Goldman/The Associated Press
Novak Djokovic of Serbia celebrates defeating Mikhail Youzhny of Russia during their quarter-final match at the U.S. Open tennis championships in New York, September 5, 2013.MIKE SEGAR/Reuters