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WUHAN, CHINA - SEPTEMBER 25: Dayana Yastremska of the Ukraine returns a shot during the match against Karolina Pliskova of the Czech Republic on Day 4 of 2019 Dongfeng Motor Wuhan Open at Optics Valley International Tennis Center on September 25, 2019 in Wuhan, China. (Photo by Zhe Ji/Getty Images)

WUHAN, CHINA - SEPTEMBER 25:  Dayana Yastremska of the Ukraine returns a shot during the match against Karolina Pliskova of the Czech Republic on Day 4 of 2019 Dongfeng Motor Wuhan Open at Optics Valley International Tennis Center on September 25, 2019 in Wuhan, China.  (Photo by Zhe Ji/Getty Images)