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

Naomi Osaka of Japan hits a return during the women's singles final match against Serena Williams of the United States 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)