Wozniacki, Stosur out,

The Dane, top seeded in the claycourt tournament, has yet to win a grand slam title and never looked like ending the statistic against the 28th seed.

Hantuchova hit 26 winners compared to just eight by Wozniacki, who has constantly faced questions about whether she deserves to be the top-ranked player in the world without shining in the majors.

The 20-year-old had a mini-revival midway through the second set but her game fell apart again and she stomped off court immediately as Hantuchova cracked the broadest of smiles.

Second seed Kim Clijsters bowed out in the second round on Thursday after losing to little-known Dutchwoman Arantxa Rus, leaving the women's draw even more wide open than it was at the start and further damaging the reputation of the tour.

Hantuchova next meets Svetlana Kuznetsova in the fourth round, Russia's 2009 winner easing past Rebecca Marino 6-0 6-4.

Inconsistent champion Francesca Schiavone ambled through after China's Peng Shuai became the second player in the women's draw to suffer debilitating health problems.

The Italian was leading 6-3 1-2 when Peng decided to pull out having been twice checked over by a doctor on court.

Peng said she had been feeling sick with a cough since Tuesday.

"It was very tough to breathe," she told reporters in a hoarse and very quiet voice. "At the start I was OK, I took some medicine. I just need rest."

Germany's Sabine Lisicki had to be carried off court on a stretcher in floods of tears on Wednesday having been on the brink of beating third seed Vera Zvonareva before folding. She later blamed an intolerance to gluten.

Schiavone, whose grunts got louder with every point, slipped 3-1 down in the first set but used her power rather than finesse to surge back and take a grip of the contest below cloudy skies.

The fifth seed plays former world number one Jelena Jankovic in the next round, after the Serbian 10th seed beat Bethanie Mattek-Sands 6-2 6-2.

"From now on I've got to up my game of course," she told reporters before cautioning against thinking about the latter stages. "To look too far ahead, how does that help?"

Gisela Dulko, fuelled by the overnight adrenaline rush of two new family arrivals, rode a strong start to beat last year's runner-up Samantha Stosur 6-4 1-6 6-3.

Having sat by the phone in her hotel room into the early hours until her brother's twins, Myla and Teo were born, the 26-year-old unseeded Argentine was still bubbling with joy when she raced to a 4-0 lead on court Philippe Chatrier before going on to record the victory.

"The key was to start well, to be aggressive from the start," Dulko told a press conference.

"Yesterday night I was awake really late. You know, it was very emotional, because I would have loved to be there, but I'm here.

"And I tried to do my best today, and that's why I did this towel for them."

"Para Myla y Teo. Valia la pena" (For Myla and Teo. It was worth it), read a towel she showed the crowd after sealing the win with a forehand winner.

"She seemed to be out ahead a little bit better and really kind of be the one dictating the points, which, for me, I'm usually the one able to do that," said a dejected Stosur.

"Pretty much right from the first game she kind of set that tone, and it was very difficult for me to turn that around."

Australia's Stosur, the eighth seed, began terribly as Dulko dominated all areas without having to put in an especially sparkling display.

Stosur looked to have regained control when she hit back in to take the second set comfortably but Dulko broke to go up 4-2 in the third as her opponent racked up 35 unforced errors.

The Australian joins Belgian second seed Kim Clijsters in exiting the tournament early.

Dulko will next play 11th seed Marion Bartoli, after the Frenchwoman beat Germany's Julia Goerges, seeded 17, 3-6 6-2 6-4.

World number three Vera Zvonareva recovered from her scare in the opening round to beat Australian Anastasia Rodionova 6-2 6-3 and set up a clash with compatriot, and 14th seed Anastasia Pavlyuchenkova, the Russian coming back from a set down to beat Nuria Llagostera Vives 3-6 6-3 6-3.