Croatian teenager Ana Konjuh stunned fourth-seeded Agnieszka Radwanska 6-4, 6-4 on Monday, avenging a bitter Wimbledon disappointment and reaching the quarter-finals of the US Open.

The 18-year-old, who has made it past the third round of a Grand Slam for the first time, next faces 10th-seeded Czech Karolina Pliskova, a 4-6, 6-4, 7-6 (7/3) winner over Venus Williams.

The victory over Radwanska was sweet revenge for Konjuh, who held three match points against the Pole in the second round at Wimbledon but eventually lost 9-7 in the third set after stepping on a ball and turning her ankle.