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WUHAN, CHINA - SEPTEMBER 27: Angelique Kerber of Germany holds flowers presented by WTA to celebrate being number one after defeating Kristina Mladenovic of France during their third round match on Day three of the 2016 Dongfeng Motor Wuhan Open at the Optics Valley International Tennis Center on September 27, 2016 in Wuhan, China. (Photo by Kevin Lee/Getty Images)

WUHAN, CHINA - SEPTEMBER 27:  Angelique Kerber of Germany holds flowers presented by WTA to celebrate being number one after defeating Kristina Mladenovic of France  during their third round match on Day three of the 2016 Dongfeng Motor Wuhan Open at the Optics Valley International Tennis Center on September 27, 2016 in Wuhan, China.  (Photo by Kevin Lee/Getty Images)