Barty powers through as Kyrgios and Kokkinakis duo also reach AO quarters

World no.1 Ash Barty is through to the quarter finals of the Australian Open after beating unseeded American Amanda Anisimova 6-4, 6-3 on Sunday night.

Having only lost eight games in her opening three matches, Barty was made to work harder by the 20-year-old who was coming…