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Petra Kvitova of Czech Republic hits a return during the single's first round match against Cagla Buyukakcay of Turkey at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 13, 2018. Petra Kvitova won 2-0. (Xinhua/Nikku)
Petra Kvitova of Czech Republic hits a return during the single's first round match against Cagla Buyukakcay of Turkey at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 13, 2018. Petra Kvitova won 2-0. (Xinhua/Nikku)