Former champion Ana Ivanovic bowed out of the French Open at the third-round stage on Friday.
The Serbian, a former world number one, stromed through the first set but hit the self-destruct button to lose 1-6 7-5 6-3 to Sara Errani.
Ivanovic, the winner at Roland Garros in 2008, looked well on course to reach the last 16 when she raced through the opening set in just 25 minutes.
Her winners-to-unforced-errors ratio at that point was an impressive 16-3 but 37 more errors would follow in the next two sets.
Errani dug in to stay with her opponent at the start of the second and then struck at the business end of the set.
Having levelled affairs, the Italian, seeded 21, always looked the more likely winner in the decider as Ivanovic sprayed the ball out and into the net with alarming frequency.
Errani will next meet another former champion Svetlana Kuznetsova on Sunday.
Ivanovic said: "I was really pleased the way I started. I was really aggressive and I created a lot of opportunities for myself. Then I felt in the second and third sets she started raising her level a lot and putting a lot more on the ball.
"Also on my serve, I felt I had a great rhythm on it, but I just wasn't making enough. My serve percentage was so poor. I think that was something that determined a little bit the tone for the last two sets."