LONDON, ENGLAND - NOVEMBER 20: Novak Djokovic of Serbia hits a backhand during the Singles Final against Andy Murray of Great Britain at the O2 Arena on November 20, 2016 in London, England. (Photo by Julian Finney/Getty Images)
LONDON, ENGLAND - NOVEMBER 20: Novak Djokovic of Serbia hits a backhand during the Singles Final against Andy Murray of Great Britain at the O2 Arena on November 20, 2016 in London, England. (Photo by Julian Finney/Getty Images)