By Larry Fine
NEW YORK (Reuters) - Croatian teen Ana Konjuh upset fourth seed Agnieszka Radwanska 6-4 6-4 on Monday to claim the last women's quarter-final spot at the U.S. Open.
The 18-year-old, who won the 2013 U.S. Open juniors title after claiming the Australian Open juniors crown, lost her first service game but did not yield serve again.
She cracked 38 winners, including six aces, against the Pole, who has never gone beyond the round of 16 in five attempts at Flushing Meadows.
The power-hitting teenager, who became the first Croatian woman to reach the quarter-finals at a U.S. Open, avenged a second-round loss to Radwanska at Wimbledon, where she held three match points before falling 9-7 in the third set.
"It's been an incredible night," Konjuh said in an on-court interview. "This time I got revenge, so I'm really happy."
The victory lifted Konjuh to a last eight match against 10th-seeded Karolina Pliskova of the Czech Republic, who overcame sixth-seeded American Venus Williams 4-6 6-4 7-6(3).
(Editing by Peter Rutherford)