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

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.

Carlos Alcaraz has confessed that Jannik Sinner lives “in his head” when practising. The young champions have already formed an exciting rivalry and split the Grand Slams between them last year. They could now take it to the next level at the Australian Open, where they are on a collision course for their first Major final showdown.