(CNN) -- Top-seeded Ana Ivanovic suffered a crushing quarterfinal defeat at the Brisbane International on Thursday when she capitulated 6-3 6-2 against Frenchwoman Amelie Mauresmo.
Former world No. 1 Mauresmo bounced back from her longest career match to shock Ivanovic in Brisbane.
Mauresmo had made hard work of her opening two matches -- she spent more than three hours on court before denying Julie Coin in the second round -- but saw off Serbian world No. 4 Ivanovic in 67 minutes.
Former world No. 1 Mauresmo showed her powers of recovery following the longest match of her WTA career on Wednesday to set up a semifinal against compatriot Marion Bartoli who beat Tathiana Garbin 6-3 6-3.
It was Mauresmo's first success over a top-10 player in almost two years -- the last coming in February 2007 against Kim Clijsters to win the final in Antwerp where she collected the last of her 24 career titles.
The 29-year-old Mauresmo won the Australian Open title in 2006 and said after her defeat of Ivanovic: "It feels great. I'm very proud of the way I played today from the first point to the last."
Ivanovic bemoaned her lack of recovery time after late-night exertions on Wednesday, but that was no real excuse for losing for the sixth time in eight meetings against a player eight years her senior.
A year ago Ivanovic lost in the Australian Open final to Maria Sharapova and still believes she can go one better this time. "I just have to get more consistent and work more on my serve," she said.
Second-seeded Victoria Azarenka of Belarus saw off Czech Lucie Safarova 7-6 6-4 and and faces Sara Errani in the semifinals after the Italian ousted Olga Govortsova 6-3 6-3.
Ivanovic's boyfriend Fernando Verdasco reached the last four in the men's event with a 4-6 6-0 6-3 win over Frenchman Florent Serra.
Spain's Davis Cup hero now faces Frenchman Paul-Henri Mathieu, who ousted Japanese teenager Kei Nishikori 6-3 6-4.