Ashleigh Barty has passed the sternest test yet of her US Open title credentials to equal her best-ever run in New York.
Barty delivered a serving masterclass class to reach the last 16 for the second straight year with a composed 7-5 6-3 victory over rising Greek Maria Sakkari on Friday.
Australia’s world No.2 will face either China’s 18th seed Qiang Wang or unseeded Frenchwoman Fiona Ferro next on Sunday.