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