"I've never lost against him, so obviously that's a good record to have. But because of the improvements he's made, he's an opponent not to underestimate," Federer commented on Soderling to whom he held a winning record of 12-0.

Home favourite Jo-Wilfried Tsogna withdrew midway due to back and hip injury, making the 11th seed Mikhail Youzhny from Russia enjoy an easy qualification for the quarterfinals.

Youzhny's next rival is Tomas Berdych of the Czech Republic, who swept British fourth seed Andy Murray 6-4, 7-5, 6-3.

Switzerland's Roger Federer returns the ball to Switzerland's Stanislas Wawrinka during their men's fourth round match in the French Open tennis championship at the Roland Garros stadium in Paris. Federer eased into the quarter-finals with a 6-3, 7-6 (7/5), 6-2 win.

Murray became the highest ranking men's player being knocked out so far after second seed Venus Williams lost to Nadia Petrova from Russia in the women's singles fourth round.

The American seven time Grand Slam champion Williams was beaten by the 19th seed Petrova 6-4, 6-3.

Petrova is going to play her compatriot Elena Dementieva, as the fifth seed breezily outmatched Chanelle Scheepers from South Africa 6-1, 6-3.

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