Roger Federer of Switzerland returns to Victor Hanescu of Romania during their Men's first round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 24, 2013. (AP Photo/Anja Niedringhaus)
Spain's Rafael Nadal returns against Switzerland's Stanislas Wawrinka in their quarterfinal match 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)
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)
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)
** FILE ** Bode Miller, of the United States, looking at the scoreboard after finishing third in a alpine ski, men's World Cup super-combined race in Wengen, Switzerland, Jan 13, 2012.
A visitor looks at the painting "Femme dans un fauteuil" (1927) by Spanish painter Pablo Picasso (1881-1973) in the Kunstmuseum, the art museum, in Basel, Switzerland, on Friday, March 15, 2013. (Associated Press)