Roger Federer attends the trophy ceremony at the USTA National Tennis Center in NY. (AFP Photo/Timothy A. Clary)

Ace tennis player Roger Federer portrays King Arthur in a new image that is reminiscent of Disney's animated film 'The Sword in the Stone'. (Reuters/Annie Leibovitz)

Roger Federer of Switzerland serves to James Blake of the United States during their championship match at the 2007 Cincinnati Masters tennis tournament in Cincinnati, Ohio, August 19, 2007. (Reuters Photo/John Sommers II)

Roger Federer of Switzerland chases down a forehand to Paul Capdeville of Chile at the U.S. Open tennis tournament in Flushing Meadows, New York, August 29, 2007. (Reuters Photo/Shannon Stapleton)

Roger Federer of Switzerland celebrates defeating Andy Roddick of the U.S. during their match at the U.S. Open tennis tournament in Flushing Meadows, New York, September 05, 2007. (Reuters Photo/Jeff Zelevansky)

Top seed Roger Federer of Switzerland pumps his fist during his US Open semifinal against fourth-seeded Russian Nikolay Davydenko at the USTA National Tennis Center in Flushing Meadows, New York, 08 September 2007. (AFP Photo/Timothy A. Clary)

Roger Federer of Switzerland celebrates after defeating Nikolay Davydenko of Russia in three sets in their semifinal match at the US Open tennis tournament in New York, Saturday, September 08, 2007. (AP Photo/Charles Krupa)

Roger Federer of Switzerland yells after winning the second tie-break set over Novak Djokovic of Serbia during the men's finals at the US Open tennis tournament in New York, Sunday, September 09, 2007. (AP Photo/Elise Amendola)

Federer won his fourth consecutive U.S.Open tennis tournament on September 09, 2007. Roger Federer of Switzerland holds the U.S. Open trophy in New York's Times Square, September 10, 2007. (Reuters Photo/Brendan McDermid)