Tenis: Abierto de Estados Unidos (8.31.2013)

  • Swiss tennis player Roger Federer celebrates winning against France's Adrian Mannarino during a 2013 US Open men's singles match at the USTA Billie Jean King National Tennis Center in New York on August 31, 2013. EMMANUEL DUNAND / STAFF

  • French tennis player Adrian Mannarino plays a shot against Switzerland's Roger Federer during a 2013 US Open men's singles match at the USTA Billie Jean King National Tennis Center in New York on August 31, 2013. EMMANUEL DUNAND / STAFF

  • Roger Federer of Switzerland returns a shot to Adrian Mannarino of France in the first set on Day Six of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 31, 2013 in the Flushing neighborhood of the Queens borough of New York City. ELSA / STAFF

  • Roberta Vinci of Italy hits a return to Karin Knapp of Italy during their match on the sixth day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 31 August 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time. JOHN G. MABANGLO / EFE

  • Karin Knapp of Italy hits a return to Roberta Vinci of Italy during their match on the sixth day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 31 August 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time. JOHN G. MABANGLO / EFE

  • Caroline Wozniacki, of Denmark, stretches for a return against Camila Giorgi, of Italy, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Charles Krupa / AP

  • Camila Giorgi of Italy hits a return to Caroline Wozniacki of Denmark on the sixth day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 31 August 2013. The US Open runs through 09 September, a 15-day schedule for the first time. ANDREW GOMBERT / EFE

  • Tommy Robredo of Spain hits a return to Daniel Evans of Great Britain during their match on the sixth day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 31 August 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time. PETER FOLEY / EFE

  • Daniel Evans of Great Britain hits a return to Tommy Robredo of Spain during their match on the sixth day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 31 August 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time. PETER FOLEY / EFE

  • Ana Ivanovic, of Serbia, reacts after defeating Christina McHale during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Mike Groll / AP

  • Christina McHale of the US hits a return to Ana Ivanovic of Serbia during their match on the sixth day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 31 August 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time. JOHN G. MABANGLO / EFE

  • Rafael Nadal of Spain celebrates his 6-4, 6-3, 6-3 win over Ivan Dodig of Croatia during their 2013 US Open men's singles match at the USTA Billie Jean King National Tennis Center August 31, 2013 in New York. STAN HONDA / AFP/Getty Images

  • Rafael Nadal, of Spain, reacts after defeating Ivan Dodig, of Croatia, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Mike Groll / AP

  • Ivan Dodig of Croatia returns a shot to Rafael Nadal of Spain during their 2013 US Open men's singles match at the USTA Billie Jean King National Tennis Center August 31, 2013 in New York. STAN HONDA / AFP/Getty Images

  • Rafael Nadal of Spain serves to Ivan Dodig of Croatia during their 2013 US Open men's singles match at the USTA Billie Jean King National Tennis Center August 31, 2013 in New York. STAN HONDA / AFP/Getty Images

  • Serena Williams of United States of America celebrates victory with her partner Venus Williams of the United States of America during their women's doubles second round match against Raquel Kops-Jones of the United States of America and Abigail Spears of the United States of America on Day Six of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 31, 2013 in the Flushing neighborhood of the Queens borough of New York City. Al Bello / Getty Images

  • Serena Williams of United States of America and Venus Williams of the United States of America shake hands at the net with Raquel Kops-Jones of the United States of America and Abigail Spears of the United States of America after their women's doubles second round match on Day Six of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 31, 2013 in the Flushing neighborhood of the Queens borough of New York City. Al Bello / Getty Images

  • Serena Williams, left, returns a shot over Venus Williams during a doubles match against Raquel Kops-Jones and Abigail Spears of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Mike Groll / AP

  • Simona Halep, of Romania, reacts after beating Maria Kirilenko, of Russia, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. David Goldman / AP

  • Maria Kirilenko, of Russia, returns a shot to Simona Halep, of Romania, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. David Goldman / AP

  • Alize Cornet, of France, returns a shot to Victoria Azarenka, of Belarus, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. David Goldman / AP

  • Victoria Azarenka of Belarus celebrates victory during her women's singles third round match against Alize Cornet of France on Day Six of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 31, 2013 in the Flushing neighborhood of the Queens borough of New York City. Matthew Stockman / Getty Images

  • John Isner chases down a ball to return to Philipp Kohlschreiber, of Germany, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Darron Cummings / AP

  • Philipp Kohlschreiber, of Germany, celebrates after beating John Isner during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. David Goldman / AP

  • Mikhail Kukushkin, of Kazakhstan, reacts during his match with David Ferrer, of Spain, during the third round of the U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Kathy Kmonicek / AP

  • David Ferrer, of Spain, returns a shot to Mikhail Kukushkin, of Kazakhstan, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Kathy Kmonicek / AP

  • Richard Gasquet, of France, returns a shot against Dmitry Tursunov, of Russia, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Julio Cortez / AP

  • Janko Tipsarevic, of Serbia, returns a shot to Jack Sock during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Kathy Kmonicek / AP

  • Jack Sock serves to Janko Tipsarevic, of Serbia, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Kathy Kmonicek / AP

  • Petra Kvitova, of the Czech Republic, wipes sweat from her face between points against Alison Riske during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Julio Cortez / AP

  • Dmitry Tursunov of Russia plays against Richard Gasquet of France during their 2013 US Open men's singles match at the USTA Billie Jean King National Tennis Center in New York on August 31, 2013. TIMOTHY CLARY / AFP/Getty Images

  • Alison Riske reacts after beating Petra Kvitova, of the Czech Republic, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Julio Cortez / AP

  • Milos Raonic of Canada hits a return to Feliciano Lopez of Spain during their match on the sixth day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 31 August 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time. JASON SZENES / EFE

  • Svetlana Kuznetsova, of Russia, reacts after a shot against Flavia Pennetta, of Italy, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Julio Cortez / AP

  • Feliciano Lopez of Spain hits a return to Milos Raonic of Canada during their match on the sixth day of the 2013 US Open Tennis Championship at the USTA National Tennis Center in Flushing Meadows, New York, USA, 31 August 2013. The US Open runs through Monday 09 September, a 15-day schedule for the first time. JASON SZENES / EFE

  • Daniela Hantuchova, of Slovakia, serves against Julia Glushko, of Israel, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Julio Cortez / AP

  • Flavia Pennetta of Italy plays against Svetlana Kuznetsova of Russia during their 2013 US Open women's singles match at the USTA Billie Jean King National Tennis Center in New York on August 31, 2013. TIMOTHY CLARY / AFP/Getty Images

  • Julia Glushko, of Israel, returns a shot to Daniela Hantuchova, of Slovakia, during the third round of the 2013 U.S. Open tennis tournament, Saturday, Aug. 31, 2013, in New York. Julio Cortez / AP