World number one Roger Federer saw his 25-match winning run in 2005 come crashing to an end when he was beaten in the quarter-finals of the Monte Carlo Masters by teenage French qualifier Richard Gasquet.

Federer's 6-7 (1-7) 6-2 7-6 (10-8) loss to the world No.101 was only his second in his last 53 matches, a run stretching back to the US Open last year.

Gasquet now has a semi final clash against explosive Spanish 18-year-old Rafael Nadal who crushed French Open champion Gaston Gaudio 6-3 6-0.

Spain's Juan Carlos Ferrero beat Italian Filippo Volandri 6-2 6-3 to book a semi final with defending champion Guillermo Coria who put out Spain's David Ferrer 3-6 6-4 6-3.

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