Serena Williams beats Karolina Pliskova at US Open women's quarterfinal match

Serena Williams of the United States serves during the women's quarterfinal match against Karolina Pliskova of the Cezch Republic at the 2018 US Open tennis championships in New York, the United States, Sept. 4, 2018. Williams won 2-0. (Xinhua/Li Muzi)?