NEW YORK — Wimbledon champion Petra Kvitova was stunned in the third round of the U.S. Open by a scrambling, moon-balling qualifier ranked No. 145.

Aleksandra Krunic, a 21-year-old Serb who until this week had not taken even a set from a player in the top 30, crumpled to the court in celebration and shock Saturday when she pulled off the 6-4, 6-4 upset of the third-seeded Czech.

“Of course, I didn’t expect to win,” said Krunic, the second qualifier to pull off such a shocker after 121st-ranked Mirjana Lucic-Baroni beat No. 2-seeded Simona Halep on Friday.

Even when Krunic took the lead in the second set and the Louis Armstrong Stadium crowd was cheering her on, “I just told to myself, It’s still on her, you still have nothing to lose.”

“I really focused my 100 percent not to think about anything that is happening – about the court, about so many people, about Petra,” she said.

After a week of upsets on the women’s side, only three of the top eight seeds remain, No. 1 Serena Williams, No. 5 Maria Sharapova and No. 7 Eugenie Bouchard.

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Kvitova, who would have ascended to the No. 1 ranking if she won the U.S. Open and Williams had lost before the quarterfinal, committed 34 unforced errors against the fast-moving Krunic, who slid and sometimes went into a split to chase down every ball and make her opponent hit one more shot.

Kvitova too often failed to do so, including what should have been an easy putaway of a drop shot that put Krunic a point away from winning the first set. Kvitova sprayed a backhand long on the next point to lose it.

Those problems continued in the second set, and in an epic 27-stroke rally on match point, Krunic looped several towering shots before Kvitova sailed yet another forehand out to end it.

“She played really unbelievable tennis and she put a lot of balls back … almost all of them,” said Kvitova, a two-time Wimbledon champion who has never advanced past the fourth round at the U.S. Open. “I was trying to fight and fighting every point, but it was so difficult. It wasn’t really my day.”

Krunic next faces 16th-seeded Victoria Azarenka, a straight sets winner over Elena Vesnina. Azarenka, who has lost to Williams in the U.S. Open final the last two years, says she had never seen Krunic play before.

There was no upset for 11th-seeded Flavia Pennetta, who downed American wild-card Nicole Gibbs, 6-4, 6-0.

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The men’s side, meanwhile, remained largely true to form. None of the top 10 and only two of the top 20 seeded men had lost entering Saturday.

Novak Djokovic continued that trend with a routine 6-3, 6-2, 6-2 victory over American Sam Querrey, earning a spot in the round of 16 at a 22nd consecutive Grand Slam tournament. Djokovic counts the 2011 U.S. Open among his seven major titles and has played in the past four finals at Flushing Meadows.

Eighth-seeded Andy Murray needed four sets to get past Andrey Kuznetsov in humid, overcast conditions, his first day match since he battled cramps over much of his body in a first-round victory over Robin Haase. “I ate properly, I drank properly, I felt a lot better today,” he said.

Tenth-seeded Kei Nishikori advanced in straight sets against No. 23 Leonardo Mayer, and fifth-seeded Milos Raonic took three straight tiebreakers over Victor Estrella Burgos, who at 34 was the oldest man left in the draw.

In other key matches Saturday, fellow American John Isner, seeded 13th, sought to defeat No. 22 Philipp Kohlschreiber, the man who has beaten him in the third round the last two years.

For the third time in three matches at this year’s U.S. Open, Williams faced an American, 52nd-ranked Varvara Lepchenko.

Williams has won 16 matches in a row at Flushing Meadows. She could become the first woman with three straight titles at the tournament since Chris Evert took four in a row from 1975-78.


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