Rafael Nadal of Spain wears the RM 27-02 Tourbillon, made for him by Richard Mille of Switzerland, as he plays a shot to Andrey Kuznetsov of Russia during their men's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris, France, May 30, 2015. REUTERS/Gonzalo Fuentes

Tennis - French Open - Roland Garros, Paris, France - 1/6/15
Women's Singles - USA's Serena Williams during her fourth round match
Action Images via Reuters / Jason Cairnduff
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Tennis - French Open - Roland Garros, Paris, France - 2/6/15
Men's Singles - France's Jo Wilfried Tsonga during the quarter final
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Ana Ivanovic of Serbia falls during her women's quarter-final match against Elina Svitolina of Ukraine during the French Open tennis tournament at the Roland Garros stadium in Paris, France, June 2, 2015. REUTERS/Pascal Rossignol

Tennis - French Open - Roland Garros, Paris, France - 2/6/15
Men's Singles - General view of Switzerland's Roger Federer feet
Action Images via Reuters / Jason Cairnduff
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Tennis - French Open - Roland Garros, Paris, France - 1/6/15
Women's Singles - USA's Serena Williams' Audemars Piguet watch as she serves during her fourth round match
Action Images via Reuters / Jason Cairnduff
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Tennis - French Open - Roland Garros, Paris, France - 1/6/15
Men's Singles - General view of the wedding ring belonging to Great Britain's Andy Murray tied to his trainer during the fourth round
Action Images via Reuters / Jason Cairnduff
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Tennis - French Open - Roland Garros, Paris, France - 2/6/15
Men's Singles - France's Jo Wilfried Tsonga celebrates winning his quarter final match
Action Images via Reuters / Jason Cairnduff
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Stan Wawrinka of Switzerland holds balls on his racket as he prepares to serve to Gilles Simon of France during their men's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris, France, May 31, 2015. REUTERS/Vincent Kessler

Rafael Nadal of Spain changes his shirt between games during the men's singles match against Andrey Kuznetsov of Russia at the French Open tennis tournament at the Roland Garros stadium in Paris, France, May 30, 2015. REUTERS/Gonzalo Fuentes

Alize Cornet of France reacts during the women's singles match against Elina Svitolina of Ukraine at the French Open tennis tournament at the Roland Garros stadium in Paris, France, May 31, 2015. REUTERS/Pascal Rossignol

The shoes and the racket of Maria Sharapova of Russia are pictured as she prepares to serve to Lucie Safarova of the Czech Republic during their women's singles match during the French Open tennis tournament at the Roland Garros stadium in Paris, France, June 1, 2015. REUTERS/Gonzalo Fuentes 

Richard Gasquet of France celebrates after beating Kevin Anderson of South Africa during their men's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris, France, May 30, 2015. REUTERS/Pascal Rossignol

Gael Monfils of France plays a shot to Pablo Cuevas of Uruguay during their men's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris, France, May 29, 2015. REUTERS/Gonzalo Fuentes 

A close-up picture shows Maria Sharapova of Russia as she prepares to serve to Samantha Stosur of Australia during their women's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris, France, May 29, 2015. REUTERS/Gonzalo Fuentes

Ana Ivanovic of Serbia falls on the court during the women's singles match against Ekaterina Makarova of Russia at the French Open tennis tournament at the Roland Garros stadium in Paris, France, May 31, 2015. REUTERS/Vincent Kessler