SHENZHEN, Oct. 28, 2019 Simona Halep of Romania celebrates after the women's singles round robin match against Bianca Andreescu of Canada at the WTA finals Tennis Tournament in Shenzhen, south China's Guangdong Province, Oct. 28, 2019. (Credit Image: © Liang Xu/Xinhua via ZUMA Wire/HEPTA/SPORT PICTURES)

SHENZHEN, Oct. 28, 2019 Simona Halep of Romania returns the ball during the women's singles round robin match against Bianca Andreescu of Canada at the WTA finals Tennis Tournament in Shenzhen, south China's Guangdong Province, Oct. 28, 2019. (Credit Image: © Liang Xu/Xinhua via ZUMA Wire/HEPTA/SPORT PICTURES)

SHENZHEN, Oct. 28, 2019 Simona Halep of Romania returns the ball during the women's singles round robin match against Bianca Andreescu of Canada at the WTA finals Tennis Tournament in Shenzhen, south China's Guangdong Province, Oct. 28, 2019. (Credit Image: © Liang Xu/Xinhua via ZUMA Wire/HEPTA/SPORT PICTURES)