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WUHAN, CHINA - SEPTEMBER 26: Petra Kvitova of Czech returns a shot during the match against Dayana Yastremska of Ukraine on Day 5 of 2019 Dongfeng Motor Wuhan Open at Optics Valley International Tennis Center on September 26, 2019 in Wuhan, China. (Photo by Wang He/Getty Images)

WUHAN, CHINA - SEPTEMBER 26:  Petra Kvitova of Czech returns a shot during the match against Dayana Yastremska of Ukraine on Day 5 of 2019 Dongfeng Motor Wuhan Open at Optics Valley International Tennis Center on September 26, 2019 in Wuhan, China.  (Photo by Wang He/Getty Images)