Henin Joins Clijsters, Kuznetsova in Warsaw Quarters

"It was very tough conditions," said Henin-Hardenne, who found herself a break down in the second set. "It was very difficult to hit the ball hard and be aggressive. It was very slow and was raining just a little bit, and it's not easy to play in these conditions. I'm happy I won in two sets."

Other seeded winners into the quarters Thursday were (4) Patty Schnyder (d. (Q) Vakulenko) and (6) Nathalie Dechy (d. local (WC) Domachowska).

Serb pin-up teen Ana Ivanovic continued her unprecedented run with a straight-set win over (3) Vera Zvonareva to collect a Top 10 scalp.

"I just tried to play my game, to attack her and get a little bit into court and get her on the move, and I think I did that pretty well," said Ivanovic, who had another Top 10 win over Svetlana Kuznetsova in March at Miami. "It's taken a lot of work. I've practiced very hard the last few months, and I'm pretty happy to see the results so fast."

Friday's quarterfinal match-ups are Farina Elia vs. Kuznetsova, Ivanovic vs. Dechy, Clijsters vs. Bovina, and Schnyder vs. Henin-Hardenne.