Australian giant-killer Casey Dellacqua will attempt to continue her dream run through the Australian Open when she takes on Serbian third seed Jelena Jankovic at Melbourne Park on Sunday night.

The West Australian 22-year-old had never won a match at the tournament before this year.

But she earned her way through to the fourth round by defeating 15th seed Patty Schnyder in the second round and former champion and 18th seed Amelie Mauresmo in the third.

In other women's matches on Sunday, world No.1 Justine Henin will continue her campaign when she meets Taiwan's Su-Wie Hsieh, the first Taiwanese ever to reach the fourth round of a grand slam event.

Defending champion Serena Williams will meet Czech 12th seed Nicole Vaidisova and Russian fifth seed Maria Sharapova will take on countrywoman Elena Dementieva.

In the men's draw, world No.2 Rafael Nadal will play Frenchman Paul-Henri Mathieu in Sunday night's feature men's match.

Argentine 10th seed David Nalbandian, who beat Australia's Peter Luczak in the second round, will meet Spanish 22nd seed Juan Carlos Ferrero in a third round clash.

Unseeded Frenchman Jo-Wilfried Tsonga, who downed Britain's Andy Murray in the opening round, will play eighth seed Richard Gasquet in an all-French fourth-round clash.

And fourth seed Nikolay Davydenko and 14th seed Mikhail Youzhny will meet in an all-Russian fourth-round encounter.

German Philipp Kohlschreiber, who knocked American Andy Roddick out of the tournament in a marathon third round contest, continues his campaign with a match against Finland's 24th seed Jarkko Nieminen.

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