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SHENZHEN, CHINA - OCTOBER 27: Petra Kvitova of the Czech Republic plays a shoot against Naomi Osaka of Japan during their Women's Singles match on Day One of the 2019 WTA Finals at Shenzhen Bay Sports Center on October 27, 2019 in Shenzhen, China. (Photo by Lintao Zhang/Getty Images)

SHENZHEN, CHINA - OCTOBER 27:  Petra Kvitova of the Czech Republic plays a shoot against Naomi Osaka of Japan during their Women's Singles match on Day One of the 2019 WTA Finals at Shenzhen Bay Sports Center on October 27, 2019 in Shenzhen, China.  (Photo by Lintao Zhang/Getty Images)