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.

Elsewhere, in the men's draw, American 12th seed Tommy Paul will take on Spain's Alejandro Davidovich Fokina, while German second seed Alexander Zverev faces French 14th seed Ugo Humbert. The winners of these matches will advance to the semi-finals.

By Shrivathsa Sridhar MELBOURNE (Reuters) -Defending champion Aryna Sabalenka overcame a wobbly display to reach the Australian Open fourth round while Carlos Alcaraz was at his dazzling best despite a blip as warm and windy weather tested the composure of players on Friday.