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Katerina Siniakova of Czech Republic hits a return during the single's first round match against Naomi Osaka of Japan at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Katerina Siniakova lost 0-2. (Xinhua/Nikku)
Katerina Siniakova of Czech Republic hits a return during the single's first round match against Naomi Osaka of Japan at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 12, 2018. Katerina Siniakova lost 0-2. (Xinhua/Nikku)