New Delhi, Aug. 4 -- Clara Tauson of Denmark upset second-seeded Wimbledon champion Iga Swiatek of Poland 7-6 (1), 6-3 on Sunday night to reach the National Bank Open quarterfinals.

The 6-foot Tauson, seeded 16th in the hard-court event that ends Thursday, avenged a loss to Swiatek at Wimbledon to set up a match Tuesday with sixth-seeded Australian Open winner Madison Keys of the United States.

"I think, obviously, getting a win against her after losing to her in Wimbledon a couple of weeks ago is, obviously, nice, because I was not feeling great in that match, and I felt like I was playing some good tennis in Wimbledon," Tauson said. "So I felt like if I could keep that going, I thought I had a shot."

Tauson won her lone tour title in...