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 moved into the fourth round at Melbourne Park with a straightforward victory over Leylah Fernandez.

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