LONDON, ENGLAND - NOVEMBER 21: Novak Djokovic of Serbia hits a backhand against Dominic Thiem of Austria during Day 7 of the Nitto ATP World Tour Finals at The O2 Arena on November 21, 2020 in London, England. (Photo by TPN/Getty Images)
LONDON, ENGLAND - NOVEMBER 21: Novak Djokovic of Serbia hits a backhand against Dominic Thiem of Austria during Day 7 of the Nitto ATP World Tour Finals at The O2 Arena on November 21, 2020 in London, England. (Photo by TPN/Getty Images)