French Open [ Images ] champion Anastasia Myskina [ Images ] and compatriot Elena Dementieva [ Images ] were dumped out of the Australian Open [ Images ] on Monday.

Nathalie Dechy [ Images ] of France [ Images ] upset Russian third seed Myskina 6-4, 6-2 while Switzerland's [ Images ] Patty Schnyder [ Images ] fought back to upset Dementieva 6-7, 7-6, 6-2 to reach the quarter-finals.

Through to her first Grand Slam quarter-final at her 37th attempt, Dechy held her nerve as Myskina's game fell apart on the centre court.

Myskina one of the favourites to win in Melbourne [ Images ], made an embarrassing 45 unforced errors to contribute to her defeat.

Seeded 19th, Dechy set up a clash against Schynder in the quarter-finals on Wednesday.

The Swiss left-hander proved too consistent for the Russian, who struggled to hold her serve and was troubled by a blister on her toe, in a marathon match lasting almost three hours on Rod Laver Arena centre court.

The momentum clearly shifted in Schnyder's favour after she claimed the second-set tie-breaker 7-4.

Dementieva, runner-up at the French and U.S. Opens last year, gave Schnyder her third match point with a double fault and then lamely netted a volley.

Schnyder, who made the semi-finals last year in a career-best performance, will play either third-seeded Russian Anastasia Myskina or 19th seed Nathalie Dechy of France in the last eight.