Third seed Naomi Osaka saved two match points as she fought back to beat Garbine Muguruza and reach the Australian Open quarter-finals.
Having lost the opening set to 14th seed Muguruza, Japan's Osaka was a break down in the second and faced two match points at 5-3 in the third.
But she won four games in a row to win 4-6 6-4 7-5 against the Spaniard, who is also a former world number one.
Osaka, 23, will face Hsieh Su-Wei in the last eight.
The Taiwanese 35-year-old beat 19th seed Marketa Vondrousova 6-4 6-2 to become the oldest player to make a Grand Slam quarter-final debut in the Open era.