US Open champion Naomi Osaka came from behind to beat Latvia’s Anastasija Sevastova and reach the Australian Open quarter-finals.
The Japanese fourth seed won 4-6 6-3 6-4 to set up a meeting with sixth seed Elina Svitolina.
Ukraine’s Svitolina triumphed 6-2 1-6 6-1 in a pulsating encounter with former US Open finalist Madison Keys.
Both Svitolina and Osaka have been taken to three sets in their past two matches here.
Svitolina broke twice to take the first set but Keys won five games in a row and hit 16 winners as she went on to dominate the second.
The Ukrainian then held off five break points in a 16-minute game in the third set on her way to victory.