Feel like 18: Hsieh, 35, is oldest player to make Last 8 debut in Open Era

Hsieh Su-wei

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.

She made her Grand Slam debut in 2005 but had never gone beyond the fourth round before in 37 previous attempts. "I try to pretend I'm only 18 years old. My mental [age] is very young," she said.

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