Naomi Osaka, a two-time champion in Australia, stopped playing because of a strained abdominal muscle after dropping the first set of her match against Tokyo Olympics gold medalist Belinda Bencic.

Coco Gauff still hasn't lost a match or even at set at the Australian Open — or, actually, this season. She moved into the fourth round at Melbourne Park with a straightforward 6-4, 6-2 victory over 2021 U.

American star Coco Gauff began her Australian Open campaign with a 6-3, 6-3 win over former champion Sofia Kenin in a tricky opening contest at Melbourne Park on Monday.