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NEW YORK, NY - AUGUST 27: A general view of the Arthur Ashe Stadium during the men's singles first round match between Novak Djokovic of Serbia and Ricardas Berankis of Lithuania on Day Two of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 27, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images) ( 178229948 )

NEW YORK, NY - AUGUST 27: Novak Djokovic of Serbia celebrates victory after his men's singles first round match against Ricardas Berankis of Lithuania on Day Two of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 27, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images) ( 178230338 )

Victoria Azarenka, of Belarus, blows a kiss to the crowd after her match against Dinah Pfizenmaier, of Germany, in the first round of the 2013 U.S. Open tennis tournament, Tuesday, Aug. 27, 2013, in New York. Azarenka won 6-0, 6-0. (AP Photo/Charles Krupa) ( US Open Tennis )

NEW YORK, NY - AUGUST 27: Samantha Stosur of Australia serves to Victoria Duval of United States of America during their women's singles first round match on Day Two of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 27, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images) ( 178229490 )

NEW YORK, NY - AUGUST 27: The sunsets behind the unisphere on Day Two of the 2013 US Open at the USTA Billie Jean King National Tennis Center on August 27, 2013 in New York City. (Photo by Mike Stobe/Getty Images for the USTA) ( 178226790 )

Fans wait for autographs during the first round of the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Kathy Willens) ( US Open Tennis )

Sam Querrey signs autographs for fans during the first round of the 2013 U.S. Open tennis tournament, Tuesday, Aug. 27, 2013, in New York. (AP Photo/Kathy Willens) ( US Open Tennis )

Su-Wei Hsieh, of Taiwan, serves to Klara Zakopalova of the Czech Republic during the first round of the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/David Goldman) ( US Open Tennis )

Roger Federer of Switzerland returns a shot to Grega Zemlja of Slovenia during their 2013 US Open men's singles match at the USTA Billie Jean King National Tennis Center August 27, 2013 in New York. STAN HONDA/AFP/Getty Images ( 522364178 )

Roger Federer, of Switzerland, returns a shot to Grega Zemlja, of Slovenia, during the first round of the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Mike Groll) ( US Open Tennis )

Roger Federer, of Switzerland, greets Grega Zemlja, of Slovenia, after winning their first round match of the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Mike Groll) ( US Open Tennis )

Caroline Wozniacki of Denmark celebrates a win over Ying-Ying Duan of China during their 2013 US Open women's singles match at the USTA Billie Jean King National Tennis Center August 27, 2013 in New York. Wozniacki won, 6-2, 7-5. STAN HONDA/AFP/Getty Images ( 522361993 )

Alize Cornet, of France, takes a break during a first round match against Portugal's Maria Joao Koehler at the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/David Goldman) ( US Open Tennis )

NEW YORK, NY - AUGUST 27: Nicolas Almagro of Spain looks on during his men's singles first round match against Denis Istomin of Uzbekistan on Day Two of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 27, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images) ( 178226120 )

Novak Djokovic, of Serbia, reacts after defeating Ricardas Berankis, of Lithuania, in a first round of the U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Darron Cummings) ( US Open Tennis )

Julien Benneteau, of France, wipes sweat from his face during a first round match against Michal Przysiezny, of Poland, in the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/David Goldman) ( US Open Tennis )

Serbian tennis player Novak Djokovic plays a point against Lithuania's Ricardas Berankis during their 2013 US Open men's singles match at the USTA Billie Jean King National Tennis Center in New York on August 27, 2013. EMMANUEL DUNAND/AFP/Getty Images ( 522366232 )

In this image taken with a slow shutter speed, Novak Djokovic, of Serbia, returns a shot to†Ricardas Berankis, of Lithuania, during the first round of the U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Darron Cummings) ( US Open Tennis )

Juan Monaco of Argentina returns to Florian Mayer of Germany during their US Open 2013 men's singles match at the USTA Billie Jean King National Center August 27, 2013 in New York. DON EMMERT/AFP/Getty Images ( 522365462 )

Ying-Ying Duan of China returns a shot to Caroline Wozniacki of Denmark during their 2013 US Open women's singles match at the USTA Billie Jean King National Tennis Center August 27, 2013 in New York. STAN HONDA/AFP/Getty Images ( 522361320 )

Sam Querrey serves to Guido Pella, of Argentina, during the first round of the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Kathy Willens) ( US Open Tennis )

Fans shade themselves from the sun while watching a first round match at the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Mike Groll) ( APTOPIX US Open Tennis )

John Isner signs autographs for fans after beating Filippo Volandri, of Italy, during the first round of the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Kathy Kmonicek) ( US Open Tennis )

Larissa Niejelow, 4, hugs Elena Vesnina, of Russia, after Vesnina's first round match against Annika Beck of Germany at the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. Vesnina defeated Beck 6-1, 6-1. (AP Photo/David Goldman) ( US Open Tennis )

NEW YORK, NY - AUGUST 27: Victoria Azarenka of Belarus debuting a new Nike shoe during her women's singles first round match against Dinah Pfizenmaier of Germany on Day Two of the 2013 US Open at the USTA Billie Jean King National Tennis Center on August 27, 2013 in New York City. (Photo by Mike Stobe/Getty Images for the USTA) ( 178232554 )

NEW YORK, NY - AUGUST 27: Ricardas Berankis of Lithuania tosses the ball in the air to serve during his men's singles first round match against Novak Djokovic of Serbia on Day Two of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 27, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images) ( 178230058 )

John Isner of the US hits the ball against Filippo Volandri of Italy during their 2013 US Open men's singles match at the USTA Billie Jean King National Tennis Center in New York on August 27 , 2013. TIMOTHY CLARY/AFP/Getty Images ( 522362071 )

Caroline Wozniacki, of Denmark, returns a shot to Ying-Ying Duan, of China, during the first round of the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Mike Groll) ( US Open Tennis )

Milos Raonic, of Canada, serves to Thomas Fabbiano, of Italy, during the first round of the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Kathy Willens) ( US Open Tennis )

Sara Errani, of Italy, returns a shot to Olivia Rogowska, of Australia, during the first round of the 2013 U.S. Open tennis tournament, Tuesday, Aug. 27, 2013, in New York. (AP Photo/Darron Cummings) ( CORRECTION US Open Tennis )

Dominikia Cibulkova of Slovakia serves to Elina Svitolina of the Ukraine during their US Open 2013 women's singles match at the USTA Billie Jean King National Center August 27, 2013 in New York. DON EMMERT/AFP/Getty Images ( 522365316 )

Fans shade themselves from the sun while watching a first round match at the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Mike Groll) ( US Open Tennis )

NEW YORK, NY - AUGUST 27: A spectator uses an umbrella hat to shelter from the sun during Day Two of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 27, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images) ( 178218374 )

NEW YORK, NY - AUGUST 27: John Isner of United States of America serves to Filippo Volandri of Italy during their first round men's singles match on Day Two of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 27, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Maddie Meyer/Getty Images) ( 178229487 )

Svetlana Kuznetsova, of Russia, follow through with a serve against Mallory Burdettte, of the United States, during the first round of the 2013 U.S. Open tennis tournament, Tuesday, Aug. 27, 2013, in New York. (AP Photo/Charles Krupa) ( US Open Tennis )

Mona Barthel, of Germany, returns a shot to Johanna Larsson, of Sweden, during the first round of the 2013 U.S. Open tennis tournament, Tuesday, Aug. 27, 2013, in New York. (AP Photo/David Goldman) ( US Open Tennis )

NEW YORK, NY - AUGUST 26: Albert Ramos of Spain reacts next to his partner Fabio Fognini of Italy during their men's doubles first round match against John-Patrick Smith of Australia and Paul Hanley of Australia on Day One of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 26, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Alex Trautwig/Getty Images) ( 178214521 )

Su-Wei Hsieh, of Taiwan, returns a shot to Klara Zakopalova of the Czech Republic during the first round of the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/David Goldman) ( US Open Tennis )

Petra Kvitova, of the Czech Republic, returns a shot against Misaki Doi, of Japan, during the first round of the 2013 U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Mike Groll) ( US Open Tennis )

NEW YORK, NY - AUGUST 26: Ana Ivanovic of Serbia serves during her women's singles first round match against Anna Tatishvili of Georgia on Day One of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 26, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images) ( 178214380 )

NEW YORK, NY - AUGUST 27: Filippo Volandri of Italy returns a shot to John Isner of United States of America during their first round men's singles match on Day Two of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 27, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Maddie Meyer/Getty Images) ( 178226134 )

NEW YORK, NY - AUGUST 27: Dinah Pfizenmaier of Germany reacts during her women's singles first round match against Victoria Azarenka of Belarus on Day Two of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 27, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images) ( 178232693 )

Victoria Duval (L) of the US greets Samantha Stosur (R) of Australia following Duval's victory in their 2013 US Open women's singles match at the USTA Billie Jean King National Tennis Center in New York on August 27 , 2013. TIMOTHY CLARY/AFP/Getty Images ( 522366097 )

Belarus's Victoria Azarenka chases down a shot by†Germany's Dinah Pfizenmaier during the first round of the U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Darron Cummings) ( US Open Tennis )

Belarus tennis player Victoria Azarenka plays a point against Germany's Dinah Pfizenmaier during their 2013 US Open women's singles match at the USTA Billie Jean King National Tennis Center in New York on August 27, 2013. EMMANUEL DUNAND/AFP/Getty Images ( 522366610 )

Belarus's Victoria Azarenka reacts after defeating Germany's Dinah Pfizenmaier in a first round of the U.S. Open tennis tournament Tuesday, Aug. 27, 2013, in New York. (AP Photo/Darron Cummings) ( US Open Tennis )