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Maria Sharapova of Russia serves during her Ladies' Singles first round match against Kristina Mladenovic of France on day one of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 24, 2013 in London, England. (Photo by Clive Brunskill/Getty Images) ( 171429364 )

Kei Nishikori of Japan serves to Matthew Ebden of Australia during their men's singles tennis match at the Wimbledon Tennis Championships, in London June 25, 2013. REUTERS/Toby Melville ( TENNIS-WIMBLEDON/ )

Sloane Stephens of the United States returns the ball to Jamie Hampton of the United States during their Women's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 24, 2013. (AP Photo/Alastair Grant) ( Britain Wimbledon Tennis )

Maria Sharapova of Russia returns the ball to Kristina Mladenovic of France during their Women's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 24, 2013. (AP Photo/Anja Niedringhaus) ( Britain Wimbledon Tennis )

Anna Schmiedlova of Slovakia serves to Samantha Stosur of Australia during their Women's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday, June 25, 2013. (AP Photo/Sang Tan) ( Britain Wimbledon Tennis )

Serena Williams of the U.S. prepares to serve in her women's singles tennis match against Mandy Minella of Luxembourg at the Wimbledon Tennis Championships, in London June 25, 2013. REUTERS/Eddie Keogh ( TENNIS-WIMBLEDON/ )

Pippa Middleton and Princess Michael of Kent watch the Ladies' Singles first round match between Kristina Mladenovic of France and Maria Sharapova of Russia on day one of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 24, 2013 in London, England. (Photo by Clive Brunskill/Getty Images) ( 171427267 )

A spectator wearing Union Jack sunglasses looks on during day one of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 24, 2013 in London, England. (Photo by Julian Finney/Getty Images) ( 171440598 )

Slovakia's Anna Schmiedlova eyes the ball for a return against Australia's Samantha Stosur during their women's first round match on day two of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 25, 2013. Stosur won 6-1, 6-3. CARL COURT/AFP/Getty Images ( 520869626 )

Used tennis balls are boxed up on day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 25, 2013 in London, England. (Photo by Dan Kitwood/Getty Images) ( 171471178 )

Maria Sharapova of Russia serves during her Ladies' Singles first round match against Kristina Mladenovic of France on day one of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 24, 2013 in London, England. (Photo by Clive Brunskill/Getty Images) ( 171429957 )

Serena Williams of the United States of America plays a backhand during the warm-up before her Ladies' Signles first round match against Mandy Minella of Luxembourg on day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 25, 2013 in London, England. (Photo by Julian Finney/Getty Images) ( 171475942 )

Serbia's Ana Ivanovic returns on her way to beating France's Virginie Razzano during their first round match on day one of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 24, 2013. Ivanovic won 7-6, 6-0. GLYN KIRK/AFP/Getty Images ( 520843519 )

Bethanie Mattek-Sands of the United States returns the ball to Angelique Kerber of Germany during their Women's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday, June 25, 2013. (AP Photo/Alastair Grant) ( Britain Wimbledon Tennis )

Caroline Wozniacki of Denmark returns the ball to Estrella Cabeza Candela of Spain during their Women's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 24, 2013. (AP Photo/Sang Tan) ( Britain Wimbledon Tennis )

Shuai Peng of China serves during her Ladies' Singles first round match against Anabel Medina Garrigues of Spain on day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 25, 2013 in London, England. (Photo by Julian Finney/Getty Images) ( 171482912 )

Novak Djokovic of Serbia hits a return to Florian Mayer of Germany in their men's singles tennis match at the Wimbledon Tennis Championships, in London June 25, 2013. REUTERS/Eddie Keogh ( TENNIS-WIMBLEDON/ )

Sam Branson (L) and Jelena Ristic (bottom centre), the girlfriend of Novak Djokovic of Serbia watch his Gentlemen's Singles first round match against Florian Mayer of Germany on day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 25, 2013 in London, England. (Photo by Julian Finney/Getty Images) ( 171488764 )

France's Jeremy Chardy eyes the ball as he returns against US player Ryan Harrison during their men's first round match on day two of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 25, 2013. Chardy won 7-6, 6-4, 7-5, 6-2. ADRIAN DENNIS/AFP/Getty Images ( 520873510 )

Carlos Berlocq of Argentina plays a backhand during his Gentlemen's Singles first round match against Milos Raonic of Canada on day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 25, 2013 in London, England. (Photo by Mike Hewitt/Getty Images) ( 171491899 )

Germany's Benjamin Becker returns against Britain's Andy Murray during their men's first round match on day one of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 24, 2013. ADRIAN DENNIS/AFP/Getty Images ( 520851041 )

Russia's Maria Sharapova serves against France's Kristina Mladenovic during their women's first round match on day one of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 24, 2013. ADRIAN DENNIS/AFP/Getty Images ( 520852375 )

US player Serena Williams returns against Luxembourg's Mandy Minella during their women's first round match on day two of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 25, 2013. GLYN KIRK/AFP/Getty Images ( 520870106 )

Pippa Middleton (C), Mariann Byerwalter (L) and James Middleton talk during the gentlemen's singles match between Victor Hanescu of Romania and Roger Federer of Switzerland on day one of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 24, 2013 in London, England. (Photo by Clive Brunskill/Getty Images) ( 171420616 )

Stefan Kendal Gordy, known as Redfoo, of the band LMFAO, watches his girlfriend Victoria Azarenka of Belarus after she defeated Maria Joao Koehler of Portugal in their women's singles tennis match at the Wimbledon Tennis Championships, in London June 24, 2013. REUTERS/Eddie Keogh ( TENNIS-WIMBLEDON/ )

Britain's Elena Baltacha serves against Italy's Flavia Pennetta during their first round match on day one of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 24, 2013. BEN STANSALL/AFP/Getty Images ( 520842865 )

Melanie Oudin of the United States returns to Michelle Larcher De Brito of Portugal during their Women's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 24, 2013. (AP Photo/Alastair Grant) ( Britain Wimbledon Tennis )

France's Kristina Mladenovic returns against Russia's Maria Sharapova during their women's first round match on day one of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 24, 2013. Sharapova won 7-6, 6-3. ADRIAN DENNIS/AFP/Getty Images ( 520849642 )

Britain's Laura Robson returns against Russia's Maria Kirilenko during their women's first round match on day two of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 25, 2013. CARL COURT/AFP/Getty Images ( 520874155 )

Ana Ivanovic of Serbia reacts after winning a point during her women's singles tennis match against Virginie Razzano of France at the Wimbledon Tennis Championships, in London June 24, 2013. REUTERS/Toby Melville ( TENNIS-WIMBLEDON/ )

Laura Robson of Great Britain shakes hands at the net with Maria Kirilenko of Russia following her victory in the Ladies' Singles first round match on day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 25, 2013 in London, England. (Photo by Dennis Grombkowski/Getty Images) ( 171486224 )

Tsvetana Pironkova of Bulgaria serves to Anastasia Pavlyuchenkova of Russia in their women's singles tennis match at the Wimbledon Tennis Championships, in London June 25, 2013. REUTERS/Stefan Wermuth ( TENNIS-WIMBLEDON/ )

Virginie Razzano of France plays a backhand during her Women's Singles match against Ana Ivanovic of Serbia on day one of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 24, 2013 in London, England. (Photo by Julian Finney/Getty Images) ( 171414796 )

Benjamin Becker of Germany plays a forehand during his Gentlemen's Singles first round match against Andy Murray of Great Britain on day one of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 24, 2013 in London, England. (Photo by Clive Brunskill/Getty Images) ( 171431972 )

Dustin Brown of Germany serves to Guillermo Garcia-Lopez of Spain in their men's singles tennis match at the Wimbledon Tennis Championships, in London June 24, 2013. REUTERS/Toby Melville ( TENNIS-WIMBLEDON/ )

Steve Darcis of Belgium reacts as he defeats Rafael Nadal of Spain in their Men's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 24, 2013. (AP Photo/Kirsty Wigglesworth) ( Britain Wimbledon Tennis )

Novak Djokovic of Serbia signs autographs after defeating Florian Mayer of Germany in their men's singles tennis match at the Wimbledon Tennis Championships, in London June 25, 2013. REUTERS/Eddie Keogh ( TENNIS-WIMBLEDON/ )

Jelena Ristic, the girlfriend of Novak Djokovic of Serbia, sits on Centre Court for Djokovic's men's singles tennis match against Florian Mayer of Germany at the Wimbledon Tennis Championships, in London June 25, 2013. REUTERS/Eddie Keogh ( TENNIS-WIMBLEDON/ )

Maria Sharapova of Russia kicks a football during a practice session with members of her coaching team on day two of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 25, 2013 in London, England. (Photo by Dan Kitwood/Getty Images) ( 171476137 )

Russia's Maria Kirilenko returns against Britain's Laura Robson during their women's first round match on day two of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 25, 2013. Robson won 6-3, 6-4. CARL COURT/AFP/Getty Images ( 520874840 )

Germany's Carina Witthoeft returns against Japan's Kimiko Date-Krumm during their women's first round match on day two of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 25, 2013. Date-Krumm won 6-0, 6-2. ADRIAN DENNIS/AFP/Getty Images ( 520868926 )

Ana Ivanovic of Serbia reacts after losing a point during her women's singles tennis match against Virginie Razzano of France at the Wimbledon Tennis Championships, in London June 24, 2013. REUTERS/Toby Melville ( TENNIS-WIMBLEDON/ )

Petra Kvitova of the Czech Republic wipes her face during her women's singles tennis match against Coco Vandeweghe of the U.S. at the Wimbledon Tennis Championships, in London June 24, 2013. REUTERS/Toby Melville ( TENNIS-WIMBLEDON/ )

British author J K Rowling (L) sits watching the action on centre court with her husband Neil Murray (R) during play on day two of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 25, 2013. GLYN KIRK/AFP/Getty Images ( 520871483 )

Kimiko Date-Krumm of Japan plays a shot to Carina Witthoeft of Germany during their Women's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday, June 25, 2013. (AP Photo/Kirsty Wigglesworth) ( Britain Wimbledon Tennis )

Britain's Samantha Murray serves against Italy's Camila Giorgi during their women's first round match on day one of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 24, 2013. GLYN KIRK/AFP/Getty Images ( 520847848 )

Dominika Cibulkova of Slovakia plays a shot to Maria Elena Camerin of Italy during their Women's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday, June 25, 2013. (AP Photo/Alastair Grant) ( Britain Wimbledon Tennis )

Lleyton Hewitt of Australia serves to Stanislas Wawrinka of Switzerland during their Men's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 24, 2013. (AP Photo/Kirsty Wigglesworth) ( Britain Wimbledon Tennis )

US player Ryan Harrison returns against France's Jeremy Chardy during their men's first round match on day two of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 25, 2013. Chardy won 7-6, 6-4, 7-5, 6-2. ADRIAN DENNIS/AFP/Getty Images ( 520873541 )

Spain's Rafael Nadal returns against Belgium's Steve Darcis during their men's first round match on day one of the 2013 Wimbledon Championships tennis tournament at the All England Club in Wimbledon, southwest London, on June 24, 2013. BEN STANSALL/AFP/Getty Images ( 520851382 )

Maria Sharapova of Russia reacts after winning the first set against Kristina Mladenovic of France during their Women's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 24, 2013. (AP Photo/Anja Niedringhaus) ( APTOPIX Britain Wimbledon Tennis )