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BEIJING, CHINA - OCTOBER 06: Garbine Muguruza of Spain returns a shot against Irina Falconi of the United States during the Women's singles Second round match on day five of the 2015 China Open at the China National Tennis Centre on October 6, 2015 in Beijing, China. (Photo by Lintao Zhang/Getty Images)

BEIJING, CHINA - OCTOBER 06:  Garbine Muguruza of Spain returns a shot against Irina Falconi of the United States during the Women's singles Second round match on day five of the 2015 China Open at the China National Tennis Centre on October 6, 2015 in Beijing, China.  (Photo by Lintao Zhang/Getty Images)