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Serena Williams (R) of the United States shakes hands with Marie Bouzkova of the Czech Republic after their women's singles semifinal match at the 2019 Rogers Cup in Toronto, Canada, Aug. 10, 2019. (Xinhua/Zou Zheng)

Serena Williams (R) of the United States shakes hands with Marie Bouzkova of the Czech Republic after their women's singles semifinal match at the 2019 Rogers Cup in Toronto, Canada, Aug. 10, 2019. (Xinhua/Zou Zheng)