Ash Barty has suffered a dramatic collapse to crash out of the Australian Open at Melbourne Park.
Australia's world No.1 capitulated from a set and a service break up in a shock 1-6 6-3 6-2 quarter-final loss to Czech Karolina Muchova on Wednesday.
Barty never recovered after losing nine out of 11 games mid-match after the 27th-ranked Muchova took a medical time-out while trailing the top seed 6-1 2-0 on Rod Laver Laver Arena.
