Andy Roddick of the United States reacts against Juan Martin Del Potro of Argentina during their men's singles fourth-round match on Day 10 of the 2012 US Open. (Photo by Cameron Spencer/Getty Images)
2012 US Open - Day 10
Andy Roddick of the United States reacts against Juan Martin Del Potro of Argentina during their men's singles fourth-round match on Day 10 of the 2012 US Open. (Photo by Cameron Spencer/Getty Images)
2012 US Open - Day 10
Andy Murray of Great Britain returns a shot to Marin Cilic of Croatia during their men's singles quarterfinal match on Day 10 of the 2012 US Open. (Photo by Matthew Stockman/Getty Images)
2012 US Open - Day 10
Stanislas Wawrinka of Switzerland returns a shot during his men's singles fourth-round match against Novak Djokovic of Serbia on Day 10 of the 2012 US Open. (Photo by Clive Brunskill/Getty Images)
2012 US Open - Day 10
NBA basketball player Tyson Chandler and his daughter Sacha-Marie attend Day 10 of the 2012 US Open. (Photo by Chris Trotman/Getty Images for USTA)
2012 US Open - Day 10
Novak Djokovic of Serbia returns a shot during his men's singles fourth-round match against Stanislas Wawrinka of Switzerland on Day 10 of the 2012 US Open. (Photo by Clive Brunskill/Getty Images)
2012 US Open - Day 10
Juan Martin Del Potro of Argentina celebrates a point against Andy Roddick of the United States during their men's singles fourth-round match on Day 10 of the 2012 US Open. (Photo by Cameron Spencer/Getty Images)
2012 US Open - Day 10
Brooklyn Decker, wife of Andy Roddick of the US, watches his match against Juan Martin Del Potro. (Photo credit should read TIMOTHY A. CLARY/AFP/GettyImages)
2012 US Open - Day 10
Andy Roddick of the US (20) plays against Juan Martin Del Potro of Argentina (7) during their 2012 US Open men's singles match. (Photo credit should read TIMOTHY A. CLARY/AFP/GettyImages)
2012 US Open - Day 10
Sara Errani of Italy returns a shot against Roberta Vinci of Italy during their women's singles quarterfinal match on Day 10 of the 2012 US Open. (Photo by Clive Brunskill/Getty Images)
2012 US Open - Day 10
Janko Tipsarevic of Serbia hits a return to Philipp Kohlscheiber of Germany during their men's singles match at the 2012 US Open. (Photo credit should read DON EMMERT/AFP/GettyImages)
2012 US Open - Day 10
Marion Bartoli of France returns a shot against Maria Sharapova of Russia during their women's singles quarterfinal match on Day 10 of the 2012 U.S. Open. (Photo by Mike Stobe/Getty Images for USTA)
2012 US Open - Day 10
Maria Sharapova of Russia reacts after a shot against Marion Bartoli of France during their women's singles quarterfinal match on Day 10 of the 2012 US Open. (Photo by Cameron Spencer/Getty Images)
2012 US Open - Day 10
Maria Sharapova of Russia reacts after defeating Marion Bartoli of France in their women's singles quarterfinal match on Day 10 of the 2012 US Open. (Photo by Elsa/Getty Images)
2012 US Open - Day 10
Sara Errani of Italy hugs Roberta Vinci of Italy after their women's singles quarterfinal match on Day 10 of the 2012 US Open. (Photo by Clive Brunskill/Getty Images)
2012 US Open - Day 10
Marion Bartoli of France (11) reacts to a point against Maria Sharapova of Russia (3) during their 2012 US Open women's singles match. (Photo credit should read TIMOTHY A. CLARY/AFP/GettyImages)
