
Flavia Pennetta of Italy returns a ball to Samantha Stosur of Australia during the women's singles match at the 2015 U.S. Open in New York, the United States, Sept. 7, 2015. Flavia Pennetta won 2-0. (Xinhua/Qin Lang)

Flavia Pennetta of Italy returns a ball to Samantha Stosur of Australia during the women's singles match at the 2015 U.S. Open in New York, the United States, Sept. 7, 2015. Flavia Pennetta won 2-0. (Xinhua/Qin Lang)