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

Serena Williams (R) of the United States talks to the referee 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)