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LONDON, ENGLAND - NOVEMBER 20: Andy Murray of Great Britain in action during his victory against Novak Djokovic of Sebia during the Singles Final at the Barclays ATP World Tour Finals at O2 Arena on November 20, 2016 in London, England. (Photo by Clive Brunskill/Getty Images)

LONDON, ENGLAND - NOVEMBER 20:  Andy Murray of Great Britain in action during his victory against Novak Djokovic of Sebia during the Singles Final at the Barclays ATP World Tour Finals at O2 Arena on November 20, 2016 in London, England.  (Photo by Clive Brunskill/Getty Images)