Clijsters won nine of the final 10 games in a 6-2, 6-1 defeat of Ana Ivanovic that took 59 minutes. Clijsters said it took a few games to adapt to the wind.

Clijsters has won 18 straight matches at the U.S. Open since losing the final to fellow Belgian Justine Henin in 2003. Clijsters didn't play in 2004, won the title in 2005 and didn't play again until returning from retirement to win again last year as an unseeded player.

"In the beginning you just have to settle with the wind, you have to adjust," the second-seeded Belgian said. "I started moving forward better and started dictating the points."

Ivanovic, a 22-year-old Serb who was number1 in the world in 2008 and has dropped to number 40 now, struggled with the 16 mph (26 kph) wind.

Sixth-seeded Italian Francesca Schiavone also reached the quarterfinals as a 6-3, 6-0 winner against 20th-seeded Russian Anastasia Pavlyuchenkova. She will play Williams in the quarters.

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