Kei Nishikori of Japan celebrates after defeating Stan Wawrinka of Switzerland in their men's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Chris Trotman/Getty Images for USTA)
2014 US Open - Day 10
Skier Bode Miller and his wife Morgan Beck attend Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014.(Photo by Julian Finney/Getty Images)
2014 US Open - Day 10
J.R. Smith of the New York Knicks attends Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Julian Finney/Getty Images)
2014 US Open - Day 10
Actor Jeremy Piven and actress Bridget Moynahan attend Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Julian Finney/Getty Images)
2014 US Open - Day 10
Ben Stiller and Christine Taylor attend Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Matthew Stockman/Getty Images)
2014 US Open - Day 10
Serena Williams of the United States celebrates match point against Flavia Pennetta of Italy in their women's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Chris Trotman/Getty Images for USTA)
2014 US Open - Day 10
Serena Williams of the United States reacts against Flavia Pennetta of Italy during their women's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Chris Trotman/Getty Images for USTA)
2014 US Open - Day 10
A general view during a men's singles quarterfinal match between Novak Djokovic of Serbia and Andy Murray of Great Britain on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Alex Goodlett/Getty Images)
2014 US Open - Day 10
Novak Djokovic of Serbia returns a shot against Andy Murray of Great Britain during their men's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Alex Goodlett/Getty Images)
2014 US Open - Day 10
Andy Murray of Great Britain reacts against Novak Djokovic of Serbia during their men's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Streeter Lecka/Getty Images)
2014 US Open - Day 10
Novak Djokovic of Serbia celebrates after defeating Andy Murray of Great Britain in their men's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Streeter Lecka/Getty Images)
2014 US Open - Day 10
Andy Murray of Great Britain returns a shot to Novak Djokovic of Serbia during their men's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Julian Finney/Getty Images)
2014 US Open - Day 10
Novak Djokovic of Serbia returns a shot against Andy Murray of Great Britain during their men's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Matthew Stockman/Getty Images)
2014 US Open - Day 10
Serena Williams of the United States celebrates after defeating Flavia Pennetta of Italy in their women's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Matthew Stockman/Getty Images)
2014 US Open - Day 10
Novak Djokovic of Serbia and Andy Murray of Great Britain pose before their men's singles quarterfinal match on Day Ten of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 3, 2014. (Photo by Matthew Stockman/Getty Images)
