Fourth seed Elena Dementieva ran out of luck at the French Open after she was sent packing by Australian doubles specialist Samantha Stosur.
The Russian, 27, was a set and a break down to another Australian, Jelena Dokic, in round two when the former world number four was forced to quit because of injury.
Dementieva failed to make the most of that reprieve as she was beaten 6-3 4-6 6-1 on Philippe Chatrier court by Stosur, the 30th seed who makes the fourth round at Roland Garros for the first time in singles.
Dementieva, the 2004 runner-up, was facing a straight-sets defeat when she was broken twice in a row at the start of the second, but she recovered to take the match to a decider.
However, she started the third set in exactly the same manner and this time Stosur, who won the women's doubles at the French Open in 2006 with Lisa Raymond, made her pay.
She took a 4-0 then 5-1 lead, and clinched victory on her second match point when she nailed a cross-court forehand.
Dementieva's compatriot Svetlana Kuznetsova had no such problems on Suzanne Lenglen court.
The seventh seed demolished Hungarian Melinda Czink 6-1 6-3 and has only dropped 11 games all tournament.