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Naomi Osaka of Japan serves during the qualifying match against Lu Jingjing of China at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 10, 2018. Naomi Osaka won 2-0. (Xinhua/Nikku)

Naomi Osaka of Japan serves during the qualifying match against Lu Jingjing of China at the 2018 WTA Qatar Open in Doha, Qatar, on Feb. 10, 2018. Naomi Osaka won 2-0. (Xinhua/Nikku)