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.

While there have been plenty of surprises in the men’s bracket so far, most of the top women have progressed through the draw without an issue.

Coco Gauff and two-time defending champion Aryna Sabalenka have moved closer to another semifinal showdown at the Australian Open.