The New Nation - Internet Edition

AFP, Melbourne

World number two Svetlana Kuznetsova became a shock casualty on day six of the Australian Open on Saturday, with sixth seed Anna Chakvetadze also sent skidding out of the tournament.

The defeat of Kuznetsova, a former US Open champion, by Polish teenager Agneiszka Radwanska was the biggest upset yet on the women's side of the draw, with three of the top 10 seeds now gone by the third round.

Two top men's seeds have fallen-ninth seed Andy Murray and sixth seed Andy Roddick, who was dumped out in the early hours today in a bad-tempered five-set marathon by Germany's Philipp Kohlschreiber.

Eighteen-year-old Radwanska, ranked 28 in the world, said she was on a mission to avenge three losses to Kuznetsova last year, and fulfilled her orders, 6-3, 6-4.

"I played against her a few times, always losing, so I said 'no more'. "It's very exciting, I'm very happy," said Radwanska, who has a fourth round match against either Russians Nadia Petrova or Ekaterina Makarova.

A devastated Kuznetsova blamed herself for blowing her chances.

"I've got to learn to do it right way next time during Grand Slams. Every day you live and every day you are learn."

With rain delaying play on the outside courts at Melbourne Park, the early action was restricted to the Rod Laver and Vodafone Arenas, which have retractable roofs.

At the Rod Laver, Chakvetadze let slip a one set lead against 27th seeded Russian Maria Kirilenko, a childhood friend, crashing 6-7 (6/8), 6-1, 6-2.

"It was a really tough match, in the first set I was a little bit unlucky and I decided to tell myself 'Maria, come on, keep working, fight for every point' and I did it and I'm so happy," said Kirilenko.

"Usually, I'm losing my third match in a Grand Slam so I'm happy the tradition is broken, and I'm in the fourth round."

She now plays either the Slovak Republic's Daniela Hantuchova or Spain's Virginia Ruano-Pascual.

World number one Roger Federer's sprint towards a third consecutive title resumes when he plays Serbia's Janko Tipsarevic, but the day's marquee match is between Australia's Lleyton Hewitt and Cypriot Marcos Baghdatis.

It has added spice after Baghdatis became embroiled in a race controversy on Friday after videos surfaced of him chanting anti-Turkish slogans with a Greek supporters group involved in crowd trouble on Tuesday.