NEW YORK - AUGUST 31: Etienne de Villiers, executive chairman of the ATP, speaks with the media at a press conference prior to the start of matches on day five...

...trophy following his victory over Nikolay Davydenko of Russia in the men's singles final at the ATP Masters Cup tennis tournament in Shanghai on November 16, 2008. Djokovic won 6-1, 7-5 to...

SHANGHAI, CHINA - NOVEMBER 13: Flanked by Sun Jinfang, CEO of ATP International Brad Drewett addresses the media at a press conference to announce Rolex as the presenting sponsor...

...against Juan Martin Del Potro of Argentina in their singles match on the first day of the ATP Masters Cup tennis tournament in Shanghai on November 9, 2008. Djokovic won 7-5, 6-3. AFP...

...against Gilles Simon of France in their men's singles match on the fourth day of the ATP Masters Cup tennis tournament in Shanghai on November 12, 2008. Murray won the match 6-4, 6...

Nikolay Davydenko of Russia competes against Novak Djokovic of Serbia in a singles match of the ATP Tennis Masters Cup 2008 in Shanghai, China, Tuesday, 11 November 2008. Novak Djokovic defeated Nikolay Davydenko 2...

Andy Murray of Great Britain reacts in a singles match of the ATP Tennis Masters Cup 2008 against Gilles Simon of France, in Shanghai, November 12, 2008. Andy Murray defeated...

Spain's Rafael Nadal returns a shot to his Russian opponent Nikolay Davydenko during their ATP Paris Indoor Masters tounament quarter final tennis match on October 31, 2008 at the Palais Omnisport de...

...serves against Andy Roddick of the US in their singles match on the second day of the ATP Masters Cup tennis tournament in Shanghai on November 10, 2008. Murray won the first set 6-4...

...his loss to Gilles Simon of France in their singles match on the second day of the ATP Masters Cup tennis tournament in Shanghai on November 10, 2008. Simon upset the world number two 4...

...31: Andy Murray of Great Britain serves during his match against David Nalbandian of Argentina during the ATP Masters Series at the Palais Omnisports De Paris-Bercy on October 31, 2008 in Paris, France. (Photo...

ATP Masters Series PARIS - OCTOBER 31: Andy Murray of Great Britain plays a backhand during his match against...

SHANGHAI, CHINA - NOVEMBER 18: Roger Federer (L) of Switzerland shares a light moment with ATP executive chairman and president Etienne de Villiers during the medal ceremony of the Tennis Masters Cup at...

Spain's Rafael Nadal gets massed by a physiotherapist during a break of his ATP Paris Indoor Masters tounament quarter final tennis match against Russian Nikolay Davydenko (L) on October 31, 2008...

Swiss Roger Federer hits a return to Croatia's Marin Cilic during their ATP Paris Indoor Masters tounament third round match on October 30, 2008 at the Palais Omnisport de Paris...