Barty enter last eight in AUS OPEN

Top seed and home hope Ashleigh Barty survived a scare to battle into the Australian Open quarter-finals in three sets.The world number one beat American 18th seed Alison Riske 6-3, 1-6, 6-4 and next plays two-time Wimbledon champion Petra Kvitova, her opponent at the same stage last year.