The 32-year-old unseeded Hsieh needed one hour and 39 minutes to stun Radwanska, 26th seed, reports Efe.
"I'm coming to the big court again I think!" Hsieh said after the win.
Having previously knocked out Spain's Garbine Muguruza in the second round, Hsieh is set to play in the final 16 against Angelique Kerber of Germany, the 21st seed, who defeated Russia's Maria Sharapova 6-1, 6-3.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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