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.

The two best men's players in the world are reconfiguring the sport before their opponents' eyes. They don't know what to do about it