Naomi Osaka stuns S. Williams to win her first Grand Slam title at U.S. Open

Serena Williams of the United States hits a return during the women's singles final match against Naomi Osaka of Japan at the 2018 US Open tennis tournament in New York, the United States, Sept. 8, 2018. Osaka won 2-0 and claimed the title. (Xinhua/Wang Ying)