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.

Ukraine’s 30-year-old Elina Svitolina, the wife of celebrated Frenchman Gael Monfils and mother to their two-year-old daughter, Skai, reached the final eight in Melbourne for the first time in six years – “a lifetime ago” – by beating Veronika Kudermetova 6-4, 6-1. As always, she refused to shake the hand of a Russian opponent.