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Novak Djokovic of Serbia celebrates after the singles first round match against Damir Dzumhur of Bosnia and Herzegovina at the ATP Qatar Open Tennis match in Doha, capital of Qatar, Jan. 1, 2019. (Xinhua/Nikku)
Novak Djokovic of Serbia celebrates after the singles first round match against Damir Dzumhur of Bosnia and Herzegovina at the ATP Qatar Open Tennis match in Doha, capital of Qatar, Jan. 1, 2019. (Xinhua/Nikku)