Japan's Naomi Osaka celebrates after victory over Australia's Ashleigh Barty during their women's singles third round match on day six of the Australian Open tennis tournament in Melbourne on January 20, 2018. Pic/AFP

Japan's Naomi Osaka overpowered Ashleigh Barty 6-4 6-2 to reach the fourth round of a grand slam for the first time on Saturday, leaving the host nation without a contender for the Australian Open women's title. Barty's quantum leap from the outside the top 200 to number 17 in the world rankings over the last year had given some in Australia hope that the former cricketer might be a contender to end their 40-year wait for a women's champion.