Rafael Nadal of Spain speaks at a press conference after winning his men's singles third round match against Milos Raonic of Canada on day 5 of Shanghai Rolex Masters at Qi Zhong Tennis Centre on October 2015 in Shanghai, China
US player Serena Williams returns to US player Venus Williams during their women's singles fourth round match on day seven of the 2015 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 6, 2015. Serena Williams won the match 6-4, 6-3.
Serbia's Novak Djokovic celebrates after victory against Switzerland's Stanislas Wawrinka during their men's singles semi-final match on day twelve of the 2015 Australian Open tennis tournament in Melbourne on January
Serbia's Novak Djokovic (L) celebrates after winning against Switzerland's Roger Federer (R) their semifinal tennis match of the French Open tennis tournament at the Roland Garros stadium, on June 2012 in Paris.