Japan’s Naomi Osaka won in straight sets on her highly-anticipated return to the court at the Tokyo Olympics on Sunday, while World No. 1 Ashleigh Barty crashed out in the first round. 

Osaka defeated China’s Zheng Saisai 6-1, 6-4. She is now the clear favourite for gold after Barty, the reigning Wimbledon champion, dropped serve twice in each set and made 55 unforced errors in a 6-4, 6-3 loss to Spain’s 48th-ranked Sara Sorribes Tormo.