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Serena Williams, of the U.S, serves the ball to Russia's Svetlana Kuznetsova during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Tuesday, June 4, 2013 in Paris. Williams won 6-1, 3-6, 6-3. (AP Photo/Michel Euler) ( France Tennis French Open )

Italy's Sara Errani returns against Poland's Agniezska Radwanska, defeating her in two sets, 6-4, 7-6, in their quarterfinal match at the French Open tennis tournament, at Roland Garros stadium in Paris, Tuesday June 4, 2013. (AP Photo/Petr David Josek) ( France Tennis French Open )

French actor Jean-Paul Belmondo, center with blue scarf, watches Italy's Sara Errani defeat Poland's Agniezska Radwanska in two sets, 6-4, 7-6, in their quarterfinal match at the French Open tennis tournament, at Roland Garros stadium in Paris, Tuesday June 4, 2013. (AP Photo/Petr David Josek) ( France Tennis French Open )

Roger Federer of Switzerland serves in his Men's Singles quarter final match against Jo-Wilfried Tsonga of France during day ten of the French Open at Roland Garros on June 4, 2013 in Paris, France. (Photo by Matthew Stockman/Getty Images) ( 169908406 )

Jo-Wilfried Tsonga of France serves in his Men's Singles quarter final match against Roger Federer of Switzerland during day ten of the French Open at Roland Garros on June 4, 2013 in Paris, France. (Photo by Clive Brunskill/Getty Images) ( 169913810 )

USA's Serena Williams reacts after losing a point against Russia's Svetlana Kuznetsova during their French Tennis Open quarter final match at the Roland Garros stadium in Paris, on June 4, 2013. PATRICK KOVARIK/AFP/Getty Images ( 520286693 )

Switzerland's Roger Federer reacts as he plays France's Jo-Wilfried Tsonga during their quarterfinal match of the French Open tennis tournament at the Roland Garros stadium Tuesday, June 4, 2013 in Paris. (AP Photo/Petr David Josek) ( France Tennis French Open )

Italy's Sara Errani returns to Spain's Carla Suarez Navarro during their French Tennis Open round of sixteen match at the Roland Garros stadium in Paris, on June 2, 2013. KENZO TRIBOUILLARD/AFP/Getty Images ( 520239859 )

Switzerland's Roger Federer returns the ball to France's Gilles Simon during their fourth round match of the French Open tennis tournament at the Roland Garros stadium, Sunday, June 2, 2013 in Paris. (AP Photo/Petr David Josek) ( APTOPIX France Tennis French Open )

Russia's Maria Sharapova serves to USA's Sloane Stephens during their French Tennis Open round of sixteen match at the Roland Garros stadium in Paris, on June 3, 2013. MIGUEL MEDINA/AFP/Getty Images ( 520266054 )

Italy's Roberta Vinci hits a return to USA's Serena Williams during a French tennis Open round of 16 match at the Roland Garros stadium in Paris on June 2, 2013. THOMAS COEX/AFP/Getty Images ( 520236561 )

USA's Bethanie Mattek-Sands returns to Argentina's Paula Ormaechea during their French Tennis Open third round match at the Roland Garros stadium in Paris, on June 1, 2013. THOMAS COEX/AFP/Getty Images ( 520214813 )

Svetlana Kuznetsova of Russia plays a forehand during her Women's Singles match against Angelique Kerber of Germany on day eight of the French Open at Roland Garros on June 2, 2013 in Paris, France. (Photo by Julian Finney/Getty Images) ( 169804641 )

Carla Suarez Navarro of Spain serves to Sara Errani of Italy during their women's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris June 2, 2013. Suarez Navarro lost the match to Errani. REUTERS/Stephane Mahe ( TENNIS-OPEN )

Rafael Nadal of Spain serves in his Men's Singles match against Kei Nishikori of Japan during day nine of the French Open at Roland Garros on June 3, 2013 in Paris, France. (Photo by Julian Finney/Getty Images) ( 169854697 )

Kei Nishikori of Japan plays a forehand during the Men's Singles match against Rafael Nadal of Spain during day nine of the French Open at Roland Garros on June 3, 2013 in Paris, France. (Photo by Matthew Stockman/Getty Images) ( 169853968 )

Richard Gasquet of France serves during his Men's Singles match against Stanislas Wawrinka of Switzerland on day nine of the French Open at Roland Garros on June 3, 2013 in Paris, France. (Photo by Clive Brunskill/Getty Images) ( 169851488 )

Russia's Maria Sharapova returns to USA's Sloane Stephens during their French Tennis Open round of sixteen match at the Roland Garros stadium in Paris, on June 3, 2013. MARTIN BUREAU/AFP/Getty Images ( 520266926 )

A tennis fan waves thre French national flag in the crowd during the Men's Singles match between Stanislas Wawrinka of Switzerland and Richard Gasquet of France during day nine of the French Open at Roland Garros on June 3, 2013 in Paris, France. (Photo by Clive Brunskill/Getty Images) ( 169856519 )

Redfoo, also known as Stefan Gordy of the band LMFAO, watches as his girlfriend Victoria Azarenka of Belarus plays Francesca Schiavone of Italy in their women's singles match during the French Open tennis tournament at the Roland Garros stadium in Paris June 3, 2013. REUTERS/Vincent Kessler ( TENNIS-OPEN/ )

US actor Leonardo di Caprio (C) takes a picture as he attends a French tennis Open round of 16 match at the Roland Garros stadium in Paris on June 2, 2013. MARTIN BUREAU/AFP/Getty Images ( 520240529 )

Serbia's Novak Djokovic returns to Germany's Philipp Kohlschreiber during their French Tennis Open round of sixteen match at the Roland Garros stadium in Paris, on June 3, 2013. MIGUEL MEDINA/AFP/Getty Images ( 520259663 )

Richard Gasquet of France returns against Switzerland's Stanislas Wawrinka in their fourth round match at the French Open tennis tournament, at Roland Garros stadium in Paris, Monday June 3, 2013. (AP Photo/Petr David Josek) ( France Tennis French Open )

Spain's Rafael Nadal returns against Japan's Kei Nishikori defeating him in three sets 6-4, 6-1, 6-3, in their fourth round match at the French Open tennis tournament, at Roland Garros stadium in Paris, Monday June 3, 2013. (AP Photo/Michel Euler) ( France Tennis French Open )

Serbia's Novak Djokovic celebrates after winning a point against Germany's Philipp Kohlschreiber during their French Tennis Open round of sixteen match at the Roland Garros stadium in Paris, on June 3, 2013. THOMAS COEX/AFP/Getty Images ( 520264142 )

Belarus' Victoria Azarenka serves to France's Alize Cornet during their French Tennis Open third round match at the Roland Garros stadium in Paris, on June 1, 2013. MIGUEL MEDINA/AFP/Getty Images ( 520212412 )

Poland's Agnieszka Radwanska hits a return to Serbia's Ana Ivanovic during a French tennis Open round of 16 match at the Roland Garros stadium in Paris on June 2, 2013. KENZO TRIBOUILLARD/AFP/Getty Images ( 520245334 )

Italy's Sara Errani celebrates winning against Carla Suarez Navarro of Spain in three sets 5-7, 6-4, 6-3, in their fourth round match at the French Open tennis tournament, at Roland Garros stadium in Paris, Sunday June 2, 2013. (AP Photo/Michel Spingler) ( France Tennis French Open )

Russia's Maria Kirilenko reacts after a point against USA's Bethanie Mattek-Sands during a French tennis Open round of 16 match at the Roland Garros stadium in Paris on June 3, 2013. PATRICK KOVARIK/AFP/Getty Images ( 520260701 )

Gael Monfils of France reacts during his men's singles match against Tomas Berdych of Czech Republic at the French Open tennis tournament at the Roland Garros stadium in Paris May 27, 2013. Monfils, whose career has recently been hampered by injuries, returned to the French Open with a bang on Monday to beat Czech fifth seed Berdych in a first-round marathon. REUTERS/Vincent Kessler ( TENNIS-OPEN/MONFILS )

Serena Williams of the United States of America plays a backhand in her Women's Singles match against Anna Tatishvili of Georgia during day one of the French Open at Roland Garros on May 26, 2013 in Paris, France. (Photo by Clive Brunskill/Getty Images) ( 169508490 )

Spain's Roberto Bautista Agut hits a shot to France's Jeremy Chardy during their French Tennis Open match at the Roland Garros stadium in Paris, on May 29, 2013. KENZO TRIBOUILLARD/AFP/Getty Images ( 520139882 )

France's Michael Llodra hits a backhand shot to Canada's Milos raonic during a French tennis Open match at the Roland Garros stadium in Paris on May 29, 2013. THOMAS COEX/AFP/Getty Images ( 520139749 )

Spain's Fernando Verdasco hits a forehand shot to France's Marc Gicquel during a French tennis Open first round match at the Roland Garros stadium in Paris on May 28, 2013. KENZO TRIBOUILLARD/AFP/Getty Images ( 520125697 )

France's Maxime Teixeira serves to Poland's Lukasz Kubot during a French tennis Open first round match at the Roland Garros stadium in Paris on May 28, 2013. THOMAS COEX/AFP/Getty Images ( 520126627 )

Britain's Elena Baltacha returns to New Zealand's Marina Erakovic during their French Tennis Open first round match at the Roland Garros stadium in Paris, on May 28, 2013. KENZO TRIBOUILLARD/AFP/Getty Images ( 520126197 )

Italy's Camila Giorgi hits a forehand shot to China's Shuai Peng during a French tennis Open first at the Roland Garros stadium in Paris on May 29, 2013. MIGUEL MEDINA/AFP/Getty Images ( 520134967 )

Italy's Sara Errani returns to Netherland's Arantxa Rus during their French Tennis Open first round match at the Roland Garros stadium in Paris, on May 26, 2013. MARTIN BUREAU/AFP/Getty Images ( 520075693 )

France's Kristina Mladenovic returns to USA's Lauren Davis during their French Tennis Open first round match at the Roland Garros stadium in Paris, on May 28, 2013. KENZO TRIBOUILLARD/AFP/Getty Images ( 520124131 )

Czech Republic's Andrea Hlavackova hits a backhand shot to France's Irena Pavlovic during a French tennis Open first round match on May 26, 2013 at the Roland Garros stadium in Paris. THOMAS COEX/AFP/Getty Images ( 520075464 )

Sabine Lisicki of Germany eyes the ball during her women's singles match against Sofia Arvidsson of Sweden at the French Open tennis tournament at the Roland Garros stadium in Paris May 26, 2013. REUTERS/Gonzalo Fuentes ( TENNIS-OPEN/ )

Russia's Maria Sharapova hits a backhand shot to Taiwan's Su-Wei Hsieh during the French tennis Open first round match on May 27, 2013 at the Roland Garros stadium in Paris. PATRICK KOVARIK/AFP/Getty Images ( 520108964 )

Official balls are pictured on a court as rain falls on the third day of the French tennis Open at the Roland Garros stadium in Paris on May 28, 2013. THOMAS COEX/AFP/Getty Images ( 520120571 )

A person sits in an empty tribune of the Philippe Chatrier central court as rain falls on the third day of the French tennis Open at the Roland Garros stadium in Paris on May 28, 2013. KENZO TRIBOUILLARD/AFP/Getty Images ( 520122871 )

Employees cover a court as rain falls at the Roland Garros stadium during the third day of the French tennis Open in Paris on May 28, 2013. KENZO TRIBOUILLARD/AFP/Getty Images ( 520121481 )

Workers sweep water from a tarp covering a court during a rain delay at the French Open tennis tournament at the Roland Garros stadium in Paris May 28, 2013. REUTERS/Stephane Mahe ( TENNIS-OPEN )

Rafael Nadal of Spain celebrates match point in his Men's Singles match against Daniel Brands of Germany during day two of the French Open at Roland Garros on May 27, 2013 in Paris, France. (Photo by Getty Images/Getty Images) ( 169553472 )

France's Jeremy Chardy eyes the ball during his French Tennis Open match against Spain's Roberto Bautista Agut during at the Roland Garros stadium in Paris, on May 29, 2013. KENZO TRIBOUILLARD/AFP/Getty Images ( 520139878 )

France's Richard Gasquet hits a forehand shot to Ukraine's Sergiy Stakhovsky during a French tennis Open first round match on May 27, 2013 at the Roland Garros stadium in Paris. PATRICK KOVARIK/AFP/Getty Images ( 520105467 )

Caroline Wozniacki of Denmark plays a forehand in her Women's Singles match against Bojana Jovanovski of Serbia during day four of the French Open at Roland Garros on May 29, 2013 in Paris, France. (Photo by Getty Images/Getty Images) ( 169622941 )

Li Na of China hits a return to Anabel Medina Garrigues of Spain during their women's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris May 27, 2013. Li beat Medina Garrigues 6-3 6-4. REUTERS/Vincent Kessler ( TENNIS-WOMEN/OPEN )

Spain's Anabel Medina Garrigues hits a return to China's Li Na during their French Tennis Open first round match at the Roland Garros stadium in Paris, on May 27, 2013. MIGUEL MEDINA/AFP/Getty Images ( 520102100 )

Slovakia's Dominika Cibulkova hits a backhand shot to Ukraine's Lesia Tsurenko during a French tennis Open first round match at the Roland Garros stadium in Paris on May 28, 2013. MARTIN BUREAU/AFP/Getty Images ( 520126658 )

Sloane Stephens of the U.S. hits a return to Karin Knapp of Italy during their women's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris May 27, 2013. REUTERS/Gonzalo Fuentes ( TENNIS-OPEN/ )

Spain's Feliciano Lopez hits a shot to Portugal's Joao Sousa during their French Tennis Open match at the Roland Garros stadium in Paris, on May 29, 2013. MARTIN BUREAU/AFP/Getty Images ( 520136708 )

Spain's Guillermo Garcia-Lopez returns to USA's Jack Sock during their French Tennis Open first round match at the Roland Garros stadium in Paris, on May 28, 2013. KENZO TRIBOUILLARD/AFP/Getty Images ( 520124636 )

Slovenia's Aljaz Bedene returns to France's Jo-Wilfried Tsonga during their French Tennis Open first round match as part of the at the Roland Garros stadium in Paris, on May 27, 2013. PATRICK KOVARIK/AFP/Getty Images ( 520105785 )

A ball boy offers a ball to one of the serving players as Japan's Kei Nishikori defeats Canada's Jesse Levine in their first round match of the French Open tennis tournament, at Roland Garros stadium in Paris, Monday, May 27, 2013. (AP Photo/Petr David Josek) ( France Tennis French Open )

Serbia's Novak Djokovic reacts after a point against Belgium's David Goffin during a French tennis Open first round match at the Roland Garros stadium in Paris on May 28, 2013. THOMAS COEX/AFP/Getty Images ( 520125485 )

John Isner of the United States of America plays a forehand during the Men's Single match against Carlos Berlocq during day two of the French Open at Roland Garros on May 27, 2013 in Paris, France. (Photo by Getty Images/Getty Images) ( 169557533 )

Switzerland's Roger Federer serves against India's Somdev Devvarman in their second round match of the French Open tennis tournament, at Roland Garros stadium in Paris, Wednesday, May 29, 2013. Federer won in three sets 6-2, 6-1, 6-1. (AP Photo/Petr David Josek) ( France Tennis French Open )

A plane model bearing the colors of Emirates airlines holds a camera above the Roland Garros stadium on the second day of the French Tennis Open tournament in Paris, on May 27, 2013. THOMAS COEX/AFP/Getty Images ( 520102692 )

A general view of Suzanne Lenglen court as Tommy Haas of Germany serves in his Men's Singles match against Guillaume Rufin of France during day three of the French Open at Roland Garros on May 28, 2013 in Paris, France. (Photo by Matthew Stockman/Getty Images) ( 169591107 )

Novak Djokovic of Serbia's girlfriend Jelena Ristic and physiotherapist Milan Amanovic (R) watch his Men's Singles match against David Goffin of Belgium during day three of the French Open at Roland Garros on May 28, 2013 in Paris, France. (Photo by Julian Finney/Getty Images) ( 169599167 )

Serbia's Novak Djokovic returns against David Goffin of Belgium during their first round match at the French Open tennis tournament, at Roland Garros stadium in Paris, Tuesday, May 28, 2013. (AP Photo/Michel Spingler) ( APTOPIX France Tennis French Open )

Venus Williams of the U.S. reacts during her women's singles match against Urszula Radwanska of Poland at the French Open tennis tournament at the Roland Garros stadium in Paris May 26, 2013. REUTERS/Vincent Kessler ( TENNIS-WOMEN/OPEN )

Russia's Maria Sharapova celebrates after winning her French tennis Open first round match on May 27, 2013 at the Roland Garros stadium in Paris. PATRICK KOVARIK/AFP/Getty Images ( 520108940 )

Bojana Jovanovski of Serbia plays Caroline Wozniacki of Denmark in their women's singles match during the French Open tennis tournament at the Roland Garros stadium in Paris May 29, 2013. REUTERS/Vincent Kessler ( TENNIS-OPEN/ )

Stefanie Voegele of Switzerland is pictured during her women's singles match against Heather Watson of Britain at the French Open tennis tournament at the Roland Garros stadium in Paris May 29, 2013. REUTERS/Vincent Kessler ( TENNIS-OPEN/ )

Jamie Hampton of the U.S. is pictured during her women's singles match against Lucie Safarova of Czech Republic at the French Open tennis tournament at the Roland Garros stadium in Paris May 29, 2013. REUTERS/Gonzalo Fuentes ( TENNIS-OPEN/ )

Alize Cornet of France serves to Maria Joao Koehler of Portugal during their women's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris May 28, 2013. REUTERS/Gonzalo Fuentes ( TENNIS-OPEN/ )

Denmark's Caroline Wozniacki hits a shot to Serbia's Bojana Jovanovski during their French Tennis Open match at the Roland Garros stadium in Paris, on May 29, 2013. KENZO TRIBOUILLARD/AFP/Getty Images ( 520141469 )

Serena Williams of the United States of America serves in her Women's Singles match against Anna Tatishvili of Georgia during day one of the French Open at Roland Garros on May 26, 2013 in Paris, France. (Photo by Clive Brunskill/Getty Images) ( 169506908 )

Oracene Price, mother of Venus Williams of the U.S., center, watches her daughter's first round match against Poland Urszula Radwanska at the French Open tennis tournament in Roland Garros stadium in Paris, Sunday, May 26, 2013. (AP Photo/Michel Euler) ( France Tennis French Open )

Bethanie Mattek-Sands of United States of America plays a backhand in her Women's Singles match against Lourdes Dominguez Lino of Spain during day two of the French Open at Roland Garros on May 27, 2013 in Paris, France. (Photo by Julian Finney/Getty Images) ( 169550835 )

Venus Williams of the U.S. hits a return to Urszula Radwanska of Poland during their women's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris May 26, 2013. REUTERS/Vincent Kessler ( TENNIS-WOMEN/OPEN )

Serena Williams of the U.S. hits a return to Caroline Garcia of France during their women's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris May 29, 2013. REUTERS/Gonzalo Fuentes ( TENNIS-OPEN/ )

Maria Sharpova of Russia plays a backhand in her Women's Singles match against Hsieh Su-wei of Taiwan of during day two of the French Open at Roland Garros on May 27, 2013 in Paris, France. (Photo by Julian Finney/Getty Images) ( 169558994 )

Spain's Nicolas Almagro reacts after a point against France's Edouard Roger-Vasselin during their French Tennis Open match at the Roland Garros stadium in Paris, on May 29, 2013. PATRICK KOVARIK/AFP/Getty Images ( 520142527 )

France's Gael Monfils dives in a try to return to Czech Republic's Tomas Berdych during their French Tennis Open first round match at the Roland Garros stadium in Paris, on May 27, 2013. THOMAS COEX/AFP/Getty Images ( 520107429 )

Spain's Rafael Nadal returns to Germany's Daniel Brands during their French Tennis Open first round match at the Roland Garros stadium in Paris, on May 27, 2013. MIGUEL MEDINA/AFP/Getty Images ( 520105177 )

Serbia's Novak Djokovic hits a forehand shot to Belgium's David Goffin during a French tennis Open first round match at the Roland Garros stadium in Paris on May 28, 2013. THOMAS COEX/AFP/Getty Images ( 520125215 )

Spain's Rafael Nadal serves to Germany's Daniel Brands during their French Tennis Open first round match at the Roland Garros stadium in Paris, on May 27, 2013. MIGUEL MEDINA/AFP/Getty Images ( 520105781 )