Am Jahresende ist Djokovic die Nummer 1

REUTERSRoger Federer of Switzerland (L) talks to Novak Djokovic of Serbia after defeating him in their mens semi-final tennis match at the Wimbledon tennis championships in London July 6, 2012. REUTERS/Dylan Martinez (BRITAIN - Tags: SPORT

REUTERSTennis fans cheer for Roger Federer of Switzerland during his championship match against Novak Djokovic of Serbia at the mens Cincinnati Open tennis tournament in Cincinnati, Ohio August 19, 2012. REUTERS/John Sommers II (UNITED STATES - Tags: SPO

dapdErnests Gulbis of Latvia casts his shadow on the court as he returns the ball to David Nalbandian of Argentina during their match at the Shanghai ATP Masters 1000 tennis tournament in Shanghai, China, Monday, Oct. 10, 2011. (Foto:Alexander F. Yuan/AP/

EPAepa03017363 Roger Federer of Switzerland celebrates after winning the championship at ATP World Tour tennis singles final match against Jo-Wilfried Tsonga of France held in O2 Arena in London, Britain on 27 November 2011. EPA/KERIM OKTEN

REUTERSRoger Federer of Switzerland serves during the mens singles tennis final against Jo-Wilfried Tsonga of France at the ATP World Tour Finals at the O2 Arena in London November 27, 2011. REUTERS/Eddie Keogh (BRITAIN - Tags: SPORT TENNIS

REUTERSSwitzerlands Roger Federer kisses the winners trophy after his victory in his final match against Kei Nishikori of Japan at the Swiss Indoors ATP tennis tournament in Basel November 6, 2011. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: SPORT TENNIS

dapdSerbias Novak Djokovic returns a ball to Japans Kei Nishikori during their semifinal match at the Swiss Indoors tennis tournament at the St. Jakobshalle hall in Basel, Switzerland, Saturday, Nov. 5, 2011. (Foto:Keystone/Georgios Kefalas/AP/dapd)

EPAepa03002438 Roger Federer of Switzerland shows his trophy after beating Jo-Wilfried Tsonga of France at their final match at the BNP Paribas 2011 Masters Tennis tournament in Paris, France, 13 November 2011. EPA/CAMILLE FARGES

dapdIn this photo taken Thursday, Nov. 10 , 2011, Novak Djokovic of Serbia reacts during this match against Viktor Troicki of Serbia in the Paris Tennis Masters tournament, Thursday, Nov.10, 2011, in Paris, France. Novak Djokovic pulled out of the Paris M

EPAepa03017377 Roger Federer of Switzerland celebrates after winning the championship at ATP World Tour tennis singles final match against Jo-Wilfried Tsonga of France held in O2 Arena in London, Britain on 27 November 2011. EPA/KERIM OKTEN

REUTERSNovak Djokovic of Serbia hits a return to compatriot Janko Tipsarevic during their singles tennis match at the ATP World Tour Finals in the O2 Arena in London November 25, 2011. REUTERS/Dylan Martinez (BRITAIN - Tags: SPORT TENNIS)

REUTERSRoger Federer of Switzerland hits a return to Fernando Verdasco of Spain during their mens singles match at the U.S. Open tennis tournament in New York September 1, 2012. REUTERS/Jessica Rinaldi (UNITED STATES - Tags: SPORT TENNIS)

dapdNovak Djokovic of Serbia returns the ball to Viktor Troicki of Serbia during their match in the Paris Tennis Masters tournament, Thursday, Nov.10, 2011, in Paris, France. (Foto:Lionel Cironneau/AP/dapd)

EPAepa03297570 Novak Djokovic of Serbia returns to Roger Federer of Switzerland in their semi final match during the Wimbledon Championships at the All England Lawn Tennis Club, in London, Britain, 06 July 2012. EPA/MIGUEL MEDINA / POOL