Former world number one Venus Williams is now ranked 147th in the world.© AFP
It was one of the biggest wins of the 81st-ranked Hsieh’s career as she improved to 11-12 on the season. She made it to the quarter-finals of the Australian Open earlier this year, losing to Naomi Osaka 6-2, 6-2.
In 2018, she upset world number one Simona Halep in the third round of Wimbledon.
The 35-year-old Hsieh kept Williams on her back foot with a strong service game and precision cross court and down the line forehands.
She won 71 percent of her first serve points and had just one double fault, while Williams double faulted five times. Williams, who has 49 career WTA titles, had her serve broken four times and won just 35 percent of her second serve points.
In other matches Monday, top seed and Tokyo Olympic bronze medallist Elina Svitolina was ahead 2-0 in the deciding third set when France’s Clara Burel retired from their match.
Kristina Mladenovic defeated Zarina Diyas 6-2, 7-6 (7/3), and Czech Tereza Martincova surprised third seed Sorana Cirstea 3-6, 6-3, 6-2.
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