Tennis player Kei Nishikori of Japan (R) answers a question as Milos Raonic of Canada (C) Janko Tipsarevic of Serbia (L) listen at a press conference for the Kooyong Classic in Melbourne on January 8, 2013. An invitational event which features seven top male players ranked in the top 20, the Kooyong Classic is used by the players as a warm-up for the Australian Open which runs January 14-27. AFP PHOTO/William WEST IMAGE RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE
15 of the top male tennis players in the world (L-R) Ryan Harrison of United States, Bernard Tomic of Australia, Milos Raonic of Canada, Kei Nishikori of Japan, Fernando Verdasco of Spain, Janko Tipsarevic of Serbia, John Isner of United States, Tomas Berdych of Czech Republic, Roger Federer of Switzerland, Novak Djokovic of Serbia, Rafael Nadal of Spain, Andy Murray of Great Britain, David Ferrer of Spain, Jo-Wilfried Tsonga of France and Mardy Fish of United States look forward to the Indian Wells Open, the first of the season's ATP World Tour Masters 1000 events.
Janko Tipsarevic of Serbia slides across the clay to play a forehand during his men's singles third round match against Julien Benneteau of France during day seven of the French Open at Roland Garros on June 2, 2012 in Paris, France.
Janko Tipsarevic of Serbia celebrates winning his first round match against Lleyton Hewitt of Australia during day one of the 2013 Australian Open at Melbourne Park on January 14, 2013 in Melbourne, Australia.
Janko Tipsarevic of Serbia stretches to hit a forehand during the men's singles match against Roger Federer of Switzerland on day two of the ATP World Tour Finals at the O2 Arena on November 6, 2012 in London, England.
Janko Tipsarevic of Serbia, Jo-Wilfried Tsonga of France, Novak Djokovic of Serbia, Roger Federer of Switzerland, Andy Murray of Great Britain, Tomas Berdych of Czech Republic and Juan Martin del Potro of Argentina pose for a photo during previews for the ATP World Tour Finals Tennis on November 3, 2012 in London, England. The world's top eight tennis players arrive at the Royal Court's of Justice for the official Barclays ATP World Tour Finals Gala, hosted by Great Ormond Street Hospital Children's Charity, and generously supported by Moet & Chandon.
Janko Tipsarevic of Serbia plays a forehand in his second round match against Marco Chiudinelli of Switzerland during day four of the Rakuten Open at Ariake Colosseum on October 4, 2012 in Tokyo, Japan.