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DOHA, QATAR - JANUARY 7: Novak Djokovic of Serbia celebrates with the trophy after winning the men's singles final of the ATP Qatar Open tennis competition against Andy Murray of Great Britain held at the Khalifa International Tennis Complex on January 7, 2017 in Doha, Qatar. (Photo by AK BijuRaj/Getty Images)

DOHA, QATAR - JANUARY 7: Novak Djokovic of  Serbia  celebrates with the trophy after winning the men's singles final of the  ATP Qatar Open tennis competition against  Andy Murray of Great Britain held at the Khalifa International Tennis Complex on January 7, 2017 in Doha, Qatar. (Photo by AK BijuRaj/Getty Images)