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