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Radwanska, coming off a runner-up finish at Wimbledon, was trying to become the first Polish woman to reach the quarterfinals at this tournament in the Open era. She had been 4-0 against the 20th-seeded Vinci.

“She’s really playing much better this year than before,” Radwanska said. “Really had some good results this year.”

Even with that success, Vinci couldn’t have envisioned this run when she looked at her draw here. She beat 13th-seeded Dominika Cibulkova in the third round.

“I definitely didn’t think, `Oh, I’ll make it to the quarters,’” she said. “No way.”

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AP Tennis Writer Howard Fendrich contributed to this report.

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Follow Rachel Cohen at https://twitter.com/rachelcohenap