Venus Williams' celebrated corset went under wraps Sunday, and now it's out of the French Open.

Playing with a long-sleeve top over her black lace outfit on a chilly afternoon, Williams lost in the fourth round to Nadia Petrova, 6-4, 6-3.

Williams came into the tournament seeded No. 2 behind her sister Serena, but Petrova spoiled the possibility of a sibling showdown in the final.

Petrova has been a nemesis for the Williams family lately _ she beat Serena in the third round at Madrid less than three weeks ago.

Justine Henin rallied in a winner-take-all set that seemed like a final, outslugging Maria Sharapova 6-2, 3-6, 6-3. The two former No. 1s returned to center court following an overnight suspension of the third-round showdown after two sets.

Then came Williams-Petrova, with both players bundled up on a damp, windy day. Petrova wore long sleeves and tights under a frilly skirt.

She controlled rallies with steady play from the baseline and finished strong, a problem for her in the past. Petrova swept the final four games and wobbled only once, shanking an overhead when leading love-30 in the final game.

She collected herself and won the final two points, closing out the match with an emphatic forehand winner.

Serena wore her playing outfit while watching her sister's defeat from the stands. They were to team up in a doubles match later Sunday.

Venus converted only one of seven break-point chances. In the second set she lost serve three times after taking a 2-love lead.

Petrova, seeded 19th, is a two-time semifinalist, but she's into the quarterfinals for the first time since 2005. The victory was her first against Williams in their five meetings.

Henin and Sharapova played the seesaw final set after the match was suspended late Saturday because of darkness. The pivotal moment came when Henin fell behind 0-2, love-40, then overcame four break points to hold.

She soon led 4-2, broke to go ahead 5-3 and served out the victory.

"I kept my chances to win this tournament," said the four-time champion, playing at Roland Garros for the first time since 2007. "I will give my best and enjoy it. It was a really good test."

The victory extended Henin's winning streak at Roland Garros to 24 matches. It was the first meeting between the two rivals since Henin spent 20 months in retirement before mounting a career comeback this year.

Henin next plays No. 7 Sam Stosur.

In fourth-round play, No. 5 Elena Dementieva beat unseeded Chanelle Scheepers 6-1, 6-3. No. 17 Francesca Schiavone defeated No. 30 Maria Kirilenko 6-4, 6-4.

Walking onto center court to resume her match after a 15 1/2-hour interruption, Henin smiled slightly. Sharapova followed wearing a scowl, and that intensity carried over when play began.

Sharapova pumped her fist after almost every point she won _ and often before points. Henin found herself on the defensive at first, then began sending shots into the corners, forcing Sharapova to hit on the run.

"(At) the beginning I felt like I was the one that was more aggressive," Sharapova said. "That kind of changed a little bit. She started being a little bit more aggressive, and she started feeling much better about her game."

Despite the less-than-ideal conditions, both players took ferocious swings from the baseline and charged forward when they had the chance.

Henin put a backhand winner on the line to break for 5-3. Sharapova continued to scowl.

"This is a great champion, and you have to make sure you don't give her chances," Henin said. "I really admire her, because at 5-3 in the third set, she was still believing in her chances to win the match."

Instead, Henin raced to a 40-love lead, and two points later she had the victory when Sharapova pulled a running backhand wide.

The showdown occurred early in the tournament because Sharapova was seeded 12th and Henin _ climbing in the rankings since her return _ is 22nd. Their nine previous meetings all came in the quarterfinals or later, with Henin winning six.

"I love the challenge of going out there and playing against her," Sharapova said. "If it's the first round, if it's the final, it doesn't really matter."

Sharapova ended Henin's streak of 40 consecutive sets won at Roland Garros, which tied the tournament record set by Helen Wills Moody in 1926-32. But Sharapova again came away empty at the only Grand Slam tournament she has never won.

"I definitely played some good tennis," she said, "but it wasn't enough to win the match."