Czech Republic's Radek Stepanek thanks the fans after losing his semifinal match against Serbia's Novak Djokovic at the Davidoff Swiss Indoors tennis tournament in Basle, Switzerland, Saturday, Nov. 7, 2009

Serbia's Novak Djokovic serves a ball to Switzerland's Roger Federer during the final match at the Davidoff Swiss...

Serbian Novak Djokovic celebrates his victory over French Gael Monfils at the end of their Paris Masters ATP tournament...

Serbian Novak Djokovic celebrates his victory over French Gael Monfils at the end of their Paris Masters ATP tournament...

Serbian Novak Djokovic celebrates his victory over French Gael Monfils at the end of their Paris Masters ATP tournament...

Novak Djokovic of Serbia returns the ball to Robin Soderling of Sweden during the BNP Masters indoor tennis...

BASEL, SWITZERLAND - NOVEMBER 08: Roger Federer of Switzerland dries his face in his match against Novak Djokovic of Serbia in the final during Day Seven of the Davidoff Swiss Indoors Tennis at St...

Serbia's Novak Djokovic reacts after the match against Switzerland's Stanislas Wawrinka at the quarter final tennis match at...

...Jakobshalle on November 6, 2009 in Basel, Switzerland. (Photo by Julian Finney/Getty Images) Serbia's Novak Djokovic returns the ball to Czech Republic's Radek Stepanek during the semi final match at the...

Serbia's Novak Djokovic returns the ball to Czech Republic's Radek Stepanek (out of camera range) during their semi...

Serbia's Novak Djokovic returns a ball to Czech Republic's Jan Hernych during their round of sixteen match at...

Tennis player Roger Federer from Switzerland celebrates after winning against Novak Djokovic from Serbia during their semifinals match of the 2009 US Open at the USTA Billie Jean...

Novak Djokovic, of Serbia, reacts during the third set against Radek Stepanek, of the Czech Republic, during their...

...SEPTEMBER 05: Jesse Witten of the United States reacts to a play during his match against Novak Djokovic of Serbia during day six of the 2009 U.S. Open at the USTA Billie Jean...

NEW YORK - SEPTEMBER 13: Roger Federer of Switzerland returns a shot against Novak Djokovic of Serbia during the Men�s Singles Semifinal match on day fourteen of the 2009...