Novak Djokovic beats Roger Federer to win ATP World Tour title

Watch highlights as Novak Djokovic sees off Roger Federer to claim a record fourth straight ATP World Tour Finals title.

The world number one from Serbia won 6-3 6-4 in 80 minutes at London's O2 Arena.

He ends the year with 11 titles including three Grand Slams, taking his total to 10 majors.

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