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Nikoloz Basilashvili of Georgia serves the ball during the singles quarterfinal match against Novak Djokovic of Serbia at the ATP Qatar Open tennis tournament in Doha, capital of Qatar, Jan. 3, 2019. (Xinhua/ Nikku)

Nikoloz Basilashvili of Georgia serves the ball during the singles quarterfinal match against Novak Djokovic of Serbia at the ATP Qatar Open tennis tournament in Doha, capital of Qatar, Jan. 3, 2019. (Xinhua/ Nikku)