Roger Federer made it through to a record seventh Australian Open final when South Korean Hyeon Chung retired in the second set of their semi-final.

The Swiss led 6-1 5-2 when 21-year-old Chung was forced to call it quits, two games after being treated for a blister on his left foot.

Defending champion Federer, 36, goes on to face Croatian sixth seed Marin Cilic in Sunday's final.

The world number two is seeking a sixth Australian and 20th Grand Slam title.