- Tag results for Ashleigh Barty
The two-time Wimbledon champion will now face unseeded American Danielle Collins in the semi-final.
Ash Barty will became the first local hope to play in the last eight at the Australian Open in a decade when she faces Czech rival Petra Kvitova on Tuesday.
Sabalenka made the most of breaking Australian Barty in the very first game of the match, seeing out a nip-and-tuck opening set.
Ashleigh Barty and CoCo Vandeweghe won their first Grand Slam title together Sunday, fending off three match points to beat Australian Open champions Timea Babos and Kristina Mladenovic.
Ashleigh Barty was first ear-marked as a potential force on grass after winning the 2011 junior Wimbledon title aged 15.
Caroline Wozniacki had to battle hard to book her place in the quarter-finals at the Eastbourne WTA tournament.
Sharapova giggled with delight as she revealed how she plucked up the courage to pop the question and got to practise with Nadal.
The powerful Japanese 20-year-old took the first set against the 18th seed before racing to a 4-0 lead in the second on the back of an impressive serve.