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Andrey Rublev of Russia celebrates after the singles quarterfinal match against Borna Coric of Croatia at the ATP Qatar Open in Doha, Qatar, on Jan. 4, 2018. Andrey Rublev won 2-0. (Xinhua/Nikku)

Andrey Rublev of Russia celebrates after the singles quarterfinal match against Borna Coric of Croatia at the ATP Qatar Open in Doha, Qatar, on Jan. 4, 2018. Andrey Rublev won 2-0. (Xinhua/Nikku)