Novak Djokovic put the seal on a sensational 2015 by landing a record fourth straight ATP World Tour Finals title with a 6-3 6-4 victory over Roger Federer at the O2 Arena in London.

The Serbian world number one avenged his round-robin defeat to the Swiss Maestro with a solid 6-3 6-4 success to end the season with three Grand Slams, six Masters series titles and the end of year crown.

The clash between two of the game's greats has developed into one of the most famous head-to-head encounters in tennis, but this one never reached the heights of some of their previous meetings as Djokovic rarely looked like releasing his grip on the proceedings.

Speaking in the immediate aftermath of his victory, a delighted Djokovic said: "I am enjoying every moment on the court, I cherish every moment after dreaming of it as a kid. Thank you everyone for making this year so special. "I am looking forward to our two weeks of holiday with my wife and son and away from tennis for a bit. Congratulations to Roger, it was another epic match today and I hope you enjoy your time off with your family."

The man nicknamed 'the Serbinator' held off an early challenge from Federer to break in the third game of the opening set before repeating the trick in the ninth.

The Swiss, who was looking to add to his record six titles, conjured up some sensational winners but was misfiring on the backhand, allowing Djokovic to remain in control by taking the key points.

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