
Germany's Angelique Kerber returns the ball against Puerto Rico's Monica Puig during the women's singles gold medal match of Tennis at the 2016 Rio Olympic Games in Rio de Janeiro, Brazil, on Aug. 13, 2016. Monica Puig won 2-1. (Xinhua/Yue Yuewei)

Germany's Angelique Kerber returns the ball against Puerto Rico's Monica Puig during the women's singles gold medal match of Tennis at the 2016 Rio Olympic Games in Rio de Janeiro, Brazil, on Aug. 13, 2016. Monica Puig won 2-1. (Xinhua/Yue Yuewei)