Martina Hingis will face the biggest test of her grand slam comeback and Kim Clijsters the greatest test of her injured hip when they meet in an Australian Open quarter-final at Melbourne Park.

Hingis has not dropped a set in her four matches so far, in her return to grand slam tennis after a gap of more than three years.

Her most recent victim was Australia's last player remaining in singles action, Samantha Stosur.

Clijsters, the world No.2, will be the first top-10 player Hingis has met in the tournament and will therefore provide the most telling indicator of just how good the Swiss former world No.1's comeback form is.

But Clijsters has her own questions to answer.

The Belgian has also won all four of her matches in straight sets, and after entering the tournament with a hip problem, is yet to be stretched enough to prove the injury is not hampering her game.

Clijsters said she planned to ignore the sense of occasion that will doubtless surround the match and simply focus on playing her best tennis.

"I'm just going to go out there and play my own game and that's it," she said.

"Martina, obviously she's a great champion, but when you're out there you just focus about what you have to do.

"When you're younger you're more aware of who your opponent is.

"But as you get more experience and you play the best players out there you don't think about that at all." Hingis is the only unseeded woman in the quarter-finals, with all seven other women ranked in the world's top eight.

In other quarter-final matches, German Nicolas Kiefer meets Frenchman Sebastien Grosjean and third seed Amelie Mauresmo will meet Swiss player Patty Schnyder.

On Wednesday night, world No.1 Roger Federer, who survived a five-set scare against German Tommy Haas on Monday night, will play Russian Nikolay Davydenko.

Following that match, Stosur will be back on Rod Laver Arena in the women's doubles.

Stosur and American Lisa Raymond are the world's No.1-ranked combination, and will meet German Anna-Lena Groenefeld and American Meghann Shaughnessy in a semi-final.

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