The World's top ranking Swiss Champion registered a 7-5, 1-6, 6-1, 6-2.triumph over the Spaniard to open the gap to 8-1 in their head to head record.

In the semifinals, Federer will meet fourth-seeded Russian Nikolay Davydenko, a 7-5, 6-4, 6-4 winner over No. 19 Guillermo Canas of Argentina. Davydenko maintain a winless record in eight career meetings against Federer

The Swiss Champion is seeking to win the only major that has eluded him in his illustrious career.

The other two quarterfinals will be played on Wednesday. Two-time reigning champion Rafael Nadal takes on fellow Spaniard Carlos Moya and sixth-seeded Novak Djokovic of Serbia faces unseeded Russian Igor Andreev.

In the women contest Russian Maria Sharapova defeated fellow Russian Anna Chakvetadze 6-3, 6-4 to reach the semis and play against Ana Ivanovic who became the biggest surprise of the French Open after ousting third-seeded Russian Svetlana Kuznetsova, 6-0, 3-6, 6-1.

Two-year reigning champion Justine Henin beat American Serena Williams 6-4, 6-3 to face Henin Jelena Jankovic of Serbia who knocked out Nicole Vaidisova of the Czech Republic, 6-3, 7-5.