"I was struggling, it's true," Federer said. "I was like, `OK, this could start becoming really bad here.' Thank God I played a great third and fourth set."

In the final two sets, he had 26 winners to five for Robredo.

Federer, who has reached the semifinals in a record 12 consecutive major events, is seeking the only Grand Slam title he has yet to win. He'll next play No. 4-seeded Nikolay Davydenko, who beat No. 19 Guillermo Canas 7-5, 6-4, 6-4.

Federer is 8-0 against Davydenko, including a semifinal win at the U.S. Open last year.

Henin's opponent Thursday will be No. 4-seeded Jelena Jankovic, who beat No. 6 Nicole Vaidisova 6-3, 7-5.

The other women's semifinal will be between No. 2 Maria Sharapova and No. 7 Ana Ivanovic. Sharapova beat No. 9 Anna Chakvetadze 6-3, 6-4, and Ivanovic defeated 2006 runner-up Svetlana Kuznetsova 6-0, 3-6, 6-1.

For Sharapova, Ivanovic and Jankovic, it's their best showing at the French Open. The 19-year-old Ivanovic is a first-time Grand Slam semifinalist.

"I now feel old on the circuit," said the 25-year-old Henin. "Newcomers are coming up. Women's tennis keeps getting better."

Williams revived her career by winning the Australian Open in January for her eighth Grand Slam title, and she was considered perhaps Henin's most formidable hurdle this week. The meeting was their first at Roland Garros since 2003, when a semifinal victory by Henin included boos for Williams and left a bitter aftertaste on both sides.

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