World Tour FinalsNovak 2015, Djokovic and Roger Federer win
Novak Djokovic began his bid for a record fourth straight end-of-season title with victory over Japan’s Kei Nishikori at the ATP World Tour Finals. The Serb won 6-1 6-1 in 65 minutes to seal his 15th consecutive win at the O2 Arena, a run stretching back to 2011. Roger Federer beat Tomas Berdych 6-4 6-2 […]