Novak Djokovic moved within touching distance of ending the year as the world No.1 after crushing Stan Wawrinka 6-3 6-0 at the ATP Tour Finals in London.

Djokovic needs to win all three of his Group A matches to ensure he will hold off Roger Federer in the race for first place and the Serb secured the second of those victories with a ruthless 65-minute rout at the O2 Arena on Wednesday.

The reigning Wimbledon champion will be guaranteed top spot if he beats Tomas Berdych on Friday in a match he also has to win to be certain of making the last four at the prestigious season-ending event.

Wawrinka’s loss means the Swiss world No.4 needs to defeat US Open winner Marin Cilic, thrashed 6-3 6-1 by Berdych earlier on Wednesday, to have a chance of making the last four.