Faces of the French Open

Spain's Rafael Nadal bites the Musketeers trophy after winning the 2013 French Open final against Spain's David Ferrer at the Roland Garros stadium in Paris on June 9, 2013.

Spain's David Ferrer returns a shot to Spain's Rafael Nadal during the 2013 French Open final at the Roland Garros stadium in Paris on June 9, 2013.

Spain's Rafael Nadal celebrates his victory over Spain's David Ferrer at the end of their French Open final match at the Roland Garros stadium in Paris on June 9, 2013. Nadal beat Ferrer 6-3, 6-2, 6-3 to win his eighth French Open title.

A protester against same-sex marriage runs onto court with a lit flare during the Men's Singles final match between Rafael Nadal of Spain and David Ferrer of Spain, at the French Open at Roland Garros on June 9, 2013 in Paris, France. Security personnel wrested the man to the ground and quickly hauled him away. A guard stood near Nadal, protecting him, while the protester was subdued. Nadal shook the guard's hand before resuming play.

Serena Williams of the United States celebrates her victory over Russia's Maria Sharapova at the end of their French Tennis Open final match, at the Roland Garros stadium in Paris, June 8, 2013. Williams won her 16th Grand Slam title, and her first French Open championship since 2002.

Maria Sharapova of Russia plays a forehand in her Women's Singles Final match against Serena Williams of United States during day 14 of the French Open at Roland Garros, June 8, 2013 in Paris, France.

Serena Williams of the U.S. reacts after a point against Russia's Maria Sharapova during their French tennis Open final match at the Roland Garros stadium in Paris on June 8, 2013.

Russia's Maria Sharapova reacts after a point against Serena Williams of the U.S. during the 2013 French tennis Open final at the Roland Garros stadium in Paris on June 8, 2013.

Spain's Rafael Nadal returns to Japan's Nishikori Kei during their French Tennis Open round at the Roland Garros stadium in Paris, June 3, 2013.

Japan's Naoki Nakawaga returns the ball to Britain's Luke Bambridge during their singles first round match at the French Open tennis tournament, June 2, 2013.

Alize Cornet of France returns against Victoria Azarenka of Belarus in their third round match at the French Open tennis tournament, June 1, 2013.

Belarus' Victoria Azarenka returns to Italy's Francesca Schiavone during their French Tennis Open round, June 3, 2013.

Spain's Rafael Nadal returns to Japan's Nishikori Kei during their French Tennis Open round, June 3, 2013.

Serena Williams, of the U.S, returns the ball to Roberta Vinci of Italy during their fourth round match of the French Open tennis tournament, June 2, 2013.

Japan's Nishikori Kei returns to Spain's Rafael Nadal during their French Tennis Open round, June 3, 2013.

USA's Bethanie Mattek-Sands hits a return to Russia's Maria Kirilenko during a French tennis Open round, June 3, 2013.

Spain's Rafael Nadal returns to Japan's Nishikori Kei during their French Tennis Open round, June 3, 2013.

Germany's Philipp Kohlschreiber returns to Serbia's Novak Djokovic during their French Tennis Open round, June 3, 2013.

Poland's Agniezska Radwanska serves against Serbia's Ana Ivanovic in their fourth round match at the French Open tennis tournament, June 2, 2013.

USA's Bethanie Mattek-Sands serves to Russia's Maria Kirilenko during a French tennis Open round, June 3, 2013.

Russia's Maria Kirilenko hits a return to USA's Bethanie Mattek-Sands after winning their French tennis Open round, June 3, 2013.

Kyle Edmund of Great Britain plays a forehand in his singles match against Bradley Mousley of Australia during day nine of the French Open, June 3, 2013.

France's Richard Gasquet hits a return to Switzerland's Stanislas Wawrinka during a French tennis Open round, June 3, 2013.

Alejandra Cisneros of Mexico plays a forehand during her singles match against Antonia Lottner of Germany on day nine of the French Open, June 3, 2013.

Italy's Francesca Schiavone returns against Victoria Azarenka of Belarus in their fourth round match at the French Open tennis tournament, June 3, 2013.

France's Richard Gasquet hits a return to Switzerland's Stanislas Wawrinka during a French tennis Open round, June 3, 2013.

Italy's Francesca Schiavone returns against France's Marion Bartoli in their third round match at the French Open tennis tournament, June 1, 2013.

Italy's Sara Errani returns against Carla Suarez Navarro of Spain in their fourth round match at the French Open tennis tournament, June 2, 2013.

Spain's Rafael Nadal returns against Japan's Kei Nishikori in their fourth round match at the French Open tennis tournament, June 3, 2013.

Kyle Edmund of Great Britain plays a backhand in his singles match against Bradley Mousley of Australia during day nine of the French Open, June 3, 2013.

Novak Djokovic of Serbia serves during his Singles match against Philipp Kohlschreiber of Germany on day nine of the French Open, June 3, 2013.

USA's Bethanie Mattek-Sands hits a return to Russia's Maria Kirilenko during a French tennis Open round of 16 match, June 3, 2013.

Maria Kirilenko of Russia plays a backhand during her singles match against Bethanie Mattek-Sands of the U.S. on day nine of the French Open, June 3, 2013.

France's Richard Gasquet watches his shot against Switzerland's Stanislas Wawrinka during a French tennis Open round, June 3, 2013.

Antonia Lottner of Germany plays a backhand during her singles match against Alejandra Cisneros of Mexico on day nine of the French Open, June 3, 2013.

As the world's elite tennis players gather for the French Open this week, a look at some of their most intense moments of concentration, exasperation and wonder on the court.

Melanie Oudin, of the U.S, eyes the ball as she plays China's Zheng Jie during their second round match of the French Open tennis tournament at the Roland Garros stadium, May 30, 2013 in Paris.

USA's Sloane Stephens is to return the ball to Italy's Karin Knapp, during their first round match of the French Open tennis tournament at the Roland Garros stadium in Paris, May 27, 2013.

Spain's Lourdes Dominguez Lino returns against Bethanie Mattek-Sands of the U.S. in their first round match of the French Open tennis tournament, at Roland Garros stadium in Paris, May 27, 2013.

Vania King, of the U.S, returns the ball to compatriot Sloane Stephens during their second round match of the French Open tennis tournament at the Roland Garros stadium, May 30, 2013.

Maria Sharpova of Russia plays a forehand in her Women's Singles match against Hsieh Su-wei of Taiwan of during day two of the French Open, May 27, 2013.

Mallory Burdette, of the U.S, return the ball to Poland's Agnieszka Radwanska during their second round match of the French Open tennis tournament at the Roland Garros stadium, May 29, 2013.

Serena Williams, of the U.S., returns the ball to Georgia's Anna Tatishvili during their first round match of the French Open tennis tournament at the Roland Garros stadium, May 26, 2013 in Paris.

Michael Llodra of France returns against Canada's Milos Raonic in their second round match of the French Open tennis tournament, May 29, 2013.

Serbia's Jelena Jankovic gestures biting her racket as she plays Slovakia's Daniela Hantuchova during their first round match of the French Open tennis tournament, May 28, 2013.

France's Gael Monfils returns against Latvia's Ernests Gulbis in their second round match of the French Open tennis tournament, May 29, 2013.

Madison Keys, of the U.S, returns the ball to Monica Puig, of Puerto Rico, during their second round match of the French Open tennis tournament, May 29, 2013.

France's Kristina Mladenovic serves against Lauren Davis of the U.S. during their first round match at the French Open tennis tournament, May 28, 2013.

New Zealand's Marina Erakovic returns against Slovakia's Dominika Cibulkova in their second round match of the French Open tennis tournament May 30, 2013.

Spain's Nicolas Almagro returns the ball to France's Edouard Roger-Vasselin during their second round match of the French Open tennis tournament, May 29, 2013.

Germany's Mona Barthel returns the ball to compatriot Angelique Kerber during their first round match of the French Open tennis tournament, May 27, 2013.

Italy's Sara Errani serves to Arantxa Rus, of The Netherlands, during their first round match of the French Open tennis tournament, May 26, 2013.

Spain's Rafael Nadal serves the ball to Germany's Daniel Brands during their first round match of the French Open tennis tournament, May 27, 2013.

Bethanie Mattek-Sands, of the U.S, returns the ball to China's Li Na during their second round match of the French Open tennis tournament, May 30, 2013.

Japan's Kei Nishikori returns against Slovenia's Grega Zemlja in their second round match of the French Open tennis tournament, May 30, 2013.

Sloane Stephens, of the U.S, serves the ball to compatriot Vania King during their second round match of the French Open tennis tournament at the Roland Garros stadium, May 30, 2013.

Serbia's Jelena Jankovic returns the ball to Slovakia's Daniela Hantuchova during their first round match of the French Open tennis tournament, May 28, 2013.

Stefanie Voegele of Switzerland serves against Britain's Heather Watson in their first round match of the French Open tennis tournament in Paris, May 29, 2013.

Slovakia's Dominika Cibulkova returns against New Zealand's Marina Erakovic in their second round match of the French Open tennis tournament, May 30, 2013.