Osaka in Dominant Form as Barty Makes Shock Exit

Naomi Osaka of Team Japan plays a forehand during her Women's Singles First Round match against Zheng Saisai of Team China on day two of the Tokyo 2020 Olympic Games at Ariake Tennis Park in Tokyo, Japan, on July 25, 2021. Clive Brunskill/Getty Images

TOKYO—Japan’s Naomi Osaka powered through her opening match at the Tokyo Games on Sunday as world number one Ash Barty stumbled out of the tournament after a lackluster, error-strewn performance.

Naomi Osaka of Japan reacts during her first round match against Zheng Saisai of China on day two of the Tokyo 2020 Olympic Games at Ariake Tennis Park in Tokyo, Japan, on July 25, 2021. Edgar Su/Reuters