Taiwan veteran Hsieh Su-wei said believing she was “still young” helped her sweep into a first Grand Slam quarter-final after 16 years of trying on Sunday, becoming the oldest player to make a Last 8 debut in the Open Era.

Hsieh, 35, overwhelmed Czech Marketa Vondrousova, a player 14 years her junior, in the Australian Open fourth round to set up an all-Asia clash with Japan’s Naomi Osaka. Hsieh got a early break in the opening set and never looked troubled in outwitting the 19th seed 6-4, 6-2.