Maria Sharapova of Russia celebrates match point against Sabine Lisicki of Germany in the second set during their women's singles second round match on Day Five of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2014. (Photo by Al Bello/Getty Images)
2014 US Open - Day 5
Sabine Lisicki of Germany returns a shot to Maria Sharapova of Russia during their women's singles second round match on Day Five of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2014.(Photo by Elsa/Getty Images)
2014 US Open - Day 5
Sam Groth of Australia returns a shot to Roger Federer of Switzerland during their men's singles second round match on Day Five of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2014. (Photo by Alex Goodlett/Getty Images)
2014 US Open - Day 5
Roger Federer of Switzerland celebrates after defeating Sam Groth of Australia in their men's singles second round match on Day Five of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2014.(Photo by Alex Goodlett/Getty Images)
2014 US Open - Day 5
Mirjana Lucic-Baroni of Croatia serves to Simona Halep of Romania during their women's singles third round match on Day Five of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2014. (Photo by Matthew Stockman/Getty Images)
2014 US Open - Day 5
Henrik Lundqvist (L) and his wife Therese Andersson (R) watch Roger Federer of Switzerland play against Sam Groth of Australia during their men's singles second round match on Day Five of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2014. (Photo by Elsa/Getty Images)
2014 US Open - Day 5
Caroline Wozniacki of Denmark celebrates after defeating Andrea Petkovic of Germany in their women's singles third round match on Day Five of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2014. (Photo by Matthew Stockman/Getty Images)
2014 US Open - Day 5
Lucie Safarova of the Czech Republic celebrates her match point after defeating Alize Cornet of France during their women's singles third round match on Day Five of the 2014 US Open at the USTA Billie Jean King National Tennis Center on August 29, 2014. (Photo by Matthew Stockman/Getty Images)
