(CNN) -- World number one Jelena Jankovic slumped out of the Australian Open on Sunday with a shock 6-1 6-4 fourth round loss to Marion Bartoli of France, dashing her bid to win her first Grand Slam tournament.
Jankovic reacts after a point in her fourth round Australian Open match on Sunday against Bartoli.
The 23-year-old Serb, who reached the top ranking at the end of 2008, made 15 unforced errors and had 17 winners -- the last stat being half that of former Wimbledon finalist Bartoli.
Jankovic had prepared for the Australian Open in the punishing heat of Mexico and hoped a title triumph would silence those who have questioned her right to the top spot without having won a Grand Slam title.
"I let her hit all the shots she wanted to," said Jankovic. "I let her play her game. I didn't do what I was supposed to. I couldn't get my rhythm out there."
She added: "I just started slowly. I was completely not moving my feet. I was late on many shots. I was really not there, for some reason. I don't know why.
"When I tried to focus and get into the match, things just didn't work out for me.
"Whatever she did was great for her. She played really well, and I just couldn't do what I needed to do. I got it really wrong tactically. My shots were not where I wanted them to be."
Bartoli, who has now beaten Jankovic in their last three encounters for a 4-3 lead in head-to-head meetings, said: "I was really confident, because I played really well in my last match against (Lucie) Safarova.
"I knew I could beat Jelena on a good day. It was just a matter of executing it, playing the right shot at the right time and not making too many mistakes.
"I was not overwhelmed by the situation. I just went for my shot and everything went in today. It was just a great match."
Dinara Safina survived two match points on her way to a 6-2 2-6 7-5 win against Alize Cornet, and a place in the Melbourne last eight for the first time.
The third seed trailed 5-2 in the final set and defended two match points before closing out the win against the 15th seed from France.
Safina racked up 52 unforced errors in an unpredictable performance, but did enough to set up a quarterfinal against Australian wildcard Jelena Dokic whose event comeback gathered pace with a 7-5 5-7 8-6 defeat of Alisa Kleybanova.
Cornet, who played a mixed doubles match immediately afterwards, said: "It's really a tough, tough loss. I think I'm going to think about it for a long time.
"I really tried my best, so I have nothing to regret. The match point was really two big rallies - and she was really, really strong on these two rallies."
Seventh seed Vera Zvonareva will play Bartoli in the quarterfinals after defeating fellow Russian Nadia Petrova 7-5 6-4.