London: Novak Djokovic survived his first serious test of the ATP Tour Finals as the World No 1 advanced to the final with a 6-1, 3-6, 6-0 victory over Japan's Kei Nishikori on Saturday.


Novak Djokovic 

Djokovic had swept through the group stage at London's O2 Arena in imperious style, but he was pushed harder by Nishikori, who became the first player to take a set off him since October, before a strong finish secured the Serb's fourth appearance in the final of the prestigious season-ending event.