Roger Federer

Switzerland's Roger Federer waves to the crowd after his men's singles semi-final victory over Serbia's Novak Djokovic on day 11 of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on July 6, 2012. The Swiss tennis player has won a men's record 16 Grand Slam singles titles.

View of Switzerland's Roger Federer, right, and Serbia's Novak Djokovic, playing their men's singles semi-final on day 11 of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on July 6, 2012. Married and the father of two, Federer holds both Swiss and South African citizenship because his mother was born in South Africa.

Switzerland's Roger Federer plays a smash during his men's singles semi-final victory over Serbia's Novak Djokovic on day 11 of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on July 6, 2012. Born in Basel in 1981, Federer is known for supporting several charities. In 2005,. he auctioned his U.S. Open racquet to benefit victims of Hurricane Katrina.

Roger Federer, left, serves during his men's singles semi-final victory over Serbia's Novak Djokovic on day 11 of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on July 6, 2012.

Roger Federer waves to the crowd as he and Serbia's Novak Djokovic leave the court after his men's singles semi-final victory on day 11 of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on July 6, 2012.

Roger Federer celebrates his men's singles semi-final victory over Serbia's Novak Djokovic on day 11 of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on July 6, 2012.

Roger Federer shakes hands with Novak Djokovic — Getty Images/Leon Neal

Roger Federer shakes hands with Serbia's Novak Djokovic after his men's singles semi-final victory on day 11 of the 2012 Wimbledon Championships tennis tournament at the All England Tennis Club in Wimbledon, southwest London, on July 6, 2012.

Roger Federer serves in his semi final match against Novak Djokovic of Serbia at the French Open tennis tournament in Roland Garros stadium in Paris, June 8, 2012.

Roger Federer celebrates after defeating Tomas Berdych — AP Photo/Daniel Ochoa de Olza

Roger Federer from Switzerland celebrates after defeating Tomas Berdych from the Czech Republic during their singles men's final tennis match at the Madrid Open tennis tournament in Madrid, May 13, 2012.

Roger Federer reaches for a return shot — AP Photo/John Donegan

Roger Federer of Switzerland reaches for a return shot to Rafael Nadal of Spain during their semifinal at the Australian Open tennis championship, in Melbourne, Australia, Jan. 26, 2012.

Roger Federer kisses the winners trophy — AP Photo/Kirsty Wigglesworth

Roger Federer of Switzerland holds up and kisses the winners trophy after he defeated Jo-Wilfried Tsonga of France in their singles final tennis match at the ATP World Tour Finals, in the O2 arena in London, Nov. 27, 2011.

Novak Djokovic of Serbia reacts after winning a semifinal match against Roger Federer of Switzerland at the U.S. Open tennis tournament in New York, Sept. 10, 2011.

Switzerland's Roger Federer, left, and Serbia's Novak Djokovic hug after their semi final at the French Open tennis tournament in Roland Garros stadium in Paris, June 3, 2011. Federer won, 7-6, 6-3, 3-6, 7-6..

Roger Federer of Switzerland returns the ball to Novak Djokovic of Serbia in the men's singles semifinal match of the Shanghai Masters tennis tournament in Shanghai on Oct. 16, 2010.

Roger Federer, of Switzerland, returns a shot to Robin Soderling, of Sweden, during a quarterfinal match at the U.S. Open tennis tournament in New York, Sept. 8, 2010.

Defending champion Roger Federer holds his face during his press confrence following his loss to Tomas Berdych of the Czech Republic, in their qurterfinal at the All England Lawn Tennis Championships at Wimbledon, June 30, 2010.

Switzerland's Roger Federer yells after winning the third set against Colombia's Alejandro Falla at the All England Lawn Tennis Championships at Wimbledon, June 21, 2010.

Switzerland's Roger Federer leaves the court after loosing to Latvia's Ernests Gulbis at the Rome Masters tennis tournament, in Rome, April 27, 2010.

Top seed Roger Federer of Switzerland waves to the crowd after defeating Devin Britton of the USA during the first round of the US Open tennis tournament in New York, Aug. 31, 2009.

Roger Federer of Switzerland holds the trophy after defeating Andy Roddick of U.S. in their men's final match on the Centre Court at Wimbledon, July 5, 2009.

Switzerland's Roger Federer raises the trophy after defeating Sweden's Robin Soderling during their men's singles final match of the French Open tennis tournament at the Roland Garros stadium in Paris, Sunday June 7, 2009. — AP Photo/Bernat Armangue

Roger Federer raises the trophy after defeating Sweden's Robin Soderling during their men's singles final match of the French Open tennis tournament at the Roland Garros stadium in Paris, June 7, 2009. The victory gives Federer 14 Grand Slams, tying his career wins to American Pete Sampras.