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Petra Kvitova of Czech Republic returns the ball during the single's second round match against Agnieszka Radwanska of Poland at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 14, 2018. Petra Kvitova won 2-1. (Xinhua/Nikku)
Petra Kvitova of Czech Republic returns the ball during the single's second round match against Agnieszka Radwanska of Poland at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 14, 2018. Petra Kvitova won 2-1. (Xinhua/Nikku)