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Tatjana Maria of Germany competes during the women's first round match against Tatjana Maria of Germany at the 2019 Australian Open in Melbourne, Australia, Jan. 15, 2019. Serena Williams won 2-0. (Xinhua/Lui Siu Wai)

Tatjana Maria of Germany competes during the women's first round match against Tatjana Maria of Germany at the 2019 Australian Open in Melbourne, Australia, Jan. 15, 2019. Serena Williams won 2-0. (Xinhua/Lui Siu Wai)