Maria Sharapova of Russia returns a shot against Mallory Burdette of the United States during their women's singles third-round match on Day Five of the 2012 US Open. (Photo by Cameron Spencer/Getty Images)
2012 US Open - Day 5
Laura Robson of Great Britain celebrates her victory over Na Li of China during their women's singles match at the 2012 US Open tennis tournament. (Photo credit should read DON EMMERT/AFP/GettyImages)
2012 US Open - Day 5
Ryan Harrison of the United States plays against Juan Martin Del Potro of Argentina in their men's singles second-round match on Day Five of the 2012 US Open. (Photo by Dan Istitene/Getty Images)
2012 US Open - Day 5
Novak Djokovic of Serbia returns a shot against Rogerio Dutra Silva of Brazil during their men's singles second-round match on Day Five of the 2012 US Open. (Photo by Cameron Spencer/Getty Images)
2012 US Open - Day 5
Lleyton Hewitt of Australia celebrates after defeating Gilles Muller of Luxembourg in their men's singles second-round match on Day Five of the 2012 US Open. (Photo by Al Bello/Getty Images)
2012 US Open - Day 5
Novak Djokovic of Serbia celebrates defeating Rogerio Dutra Silva of Brazil during their 2012 US Open men's singles match at the USTA Billie Jean King National Tennis Center. (Photo credit should read TIMOTHY A. CLARY/AFP/GettyImages)
2012 US Open - Day 5
Petra Kvitova of the Czech Republic serves against Pauline Parmentier of France during their women's singles third-round match on Day Five of the 2012 US Open. (Photo by Elsa/Getty Images)
2012 US Open - Day 5
Pauline Parmentier of France serves against Petra Kvitova of the Czech Republic during their women's singles third-round match on Day Five of the 2012 US Open. (Photo by Elsa/Getty Images)
2012 US Open - Day 5
Actor/director Gene Wilder attends Day Five of the 2012 US Open at the USTA Billie Jean King National Tennis Center. (Photo by Cameron Spencer/Getty Images)
2012 US Open - Day 5
Laura Robson of Great Britain signs autographs after defeating Na Li of China during their women's singles third-round match on Day Five of the 2012 US Open. (Photo by Dan Istitene/Getty Images)
2012 US Open - Day 5
Bob and Mike Bryan of the United States react during their men's doubles second-round match against Eric Butorac of the United States and Paul Hanley of Australia on Day Five of the 2012 US Open. (Photo by Al Bello/Getty Images)
2012 US Open - Day 5
Samantha Stosur of Australia (7) celebrates her victory over Varvara Lepchenko of the US (31) during their 2012 US Open women's singles match at the USTA Billie Jean King National Tennis Center. (Photo credit should read TIMOTHY A. CLARY/AFP/GettyImages)
2012 US Open - Day 5
Marion Bartoli of France plays against Kristina Mladenovic of France during their 2012 US Open women's singles match at the USTA Billie Jean King National Tennis Center. (Photo credit should read TIMOTHY A. CLARY/AFP/GettyImages)
2012 US Open - Day 5
Igor Sijsling of the Netherlands returns a shot against David Ferrer of Spain during their men's singles second-round match on Day Five of the 2012 US Open. (Photo by Elsa/Getty Images)
