Two-time Australian Open champion Naomi Osaka has stopped playing because of an injury after dropping the opening set of her third-round match against Belinda Bencic.

Swiss Belinda Bencic advanced to the last 16 of the Australian Open after two-time champion Naomi Osaka retired during Friday's third-round match with an abdominal strain that has affected her since the start of the season.

Belinda Bencic returned to the Round of 16 at the Australian Open after Naomi Osaka was forced to retire with an injury in the third round.