Russia's Maria Sharapova screams after winning the second set in the quarterfinal match against Serbia's Jelena Jankovic at the French Open tennis tournament, at Roland Garros stadium in Paris, Wednesday June 5, 2013. (AP Photo/Petr David Josek)
Switzerland's Roger Federer wipes his face 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's Jo-Wilfried Tsonga returns the ball to Switzerland's Roger Federer 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)
Serena Williams, of the U.S, reaches for a ball as she plays 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. (AP Photo/Michel Euler)
Serbia's Novak Djokovic returns against Germany's Philipp Kohlschreiber in their fourth round match at the French Open tennis tournament, at Roland Garros stadium in Paris, Monday June 3, 2013. (AP Photo/Michel Spingler)
Switzerland's Roger Federer clenches his fist after scoring against France's Gilles Simon in their fourth round match at the French Open tennis tournament, at Roland Garros stadium in Paris, Sunday June 2, 2013. (AP Photo/Christophe Ena)
Spain's Rafael Nadal returns against Slovakia's Martin Klizan in their second round match at the French Open tennis tournament, at Roland Garros stadium in Paris, Friday, May 31, 2013. (AP Photo/Michel Spingler)
Serbia's Jelena Jankovic returns the ball to Spain's Garbine Muguruza during their second round match of the French Open tennis tournament at the Roland Garros stadium Thursday, May 30, 2013 in Paris. (AP Photo/Michel Spingler)
Switzerland's Roger Federer serves the ball to India's Somdev Devvarman during their second round match of the French Open tennis tournament at the Roland Garros stadium Wednesday, May 29, 2013 in Paris. (AP Photo/Petr David Josek)
Victoria Azarenka of Belarus returns against Russia's Elena Vesnina in their first round match of the French Open tennis tournament, at Roland Garros stadium in Paris, Wednesday, May 29, 2013. (AP Photo/Christophe Ena)