Venus Williams was beaten in the fourth round of the French Open by Russia's Nadia Petrova, 6-4, 6-3 Sunday, while Roger Federer easily advanced into the quarterfinals on the men's side. Venus 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. In men's play, the top-ranked Federer continued his bid for a second successive title by beating Olympic doubles partner Stanislas Wawrinka 6-4, 7-6 (5), 6-2. Federer will next play No. 5-seeded Robin Soderling in a rematch of last year's final. Soderling advanced by beating No. 10 Marin Cilic 6-4, 6-4, 6-2. No. 4 Andy Murray was upset by No. 15 Tomas Berdych 6-4, 7-5, 6-3. Berdych will next play No. 11 Mikhail Youzhny, who advanced when eighth-seeded Jo-Wilfried Tsonga retired with a hip injury when trailing 6-2. Murray, a quarterfinalist at Roland Garros last year when he posted his best result at the clay-court Grand Slam, struggled with his first serve and was broken five times by his opponent. Berdych and Youzhny are first-time Roland Garros quarterfinalists. Joining Petrova in the women's quarterfinals were No. 3 Caroline Wozniacki, No. 5 Elena Dementieva and No. 17 Francesca Schiavone. Petrova 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 later teamed up in a third-round doubles match, beating Andrea Hlavackova and Lucie Hradecka 6-1, 6-2. 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 Venus 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. Federer struggled with the wind at times and fell behind 4-2 in the second set, but the No. 20-seeded Wawrinka couldn't hold the lead and missed an easy volley at 5-all in the tiebreaker. When Wawrinka lost the set he mangled his racket, and Federer quickly pulled away after that. The defending champion has won all 12 sets so far.
