Lleyton Hewitt will take on Moroccan Younes El Aynaoui at Melbourne Park today in a replay of last year's US Open quarter-final.

On that occasion, Hewitt prevailed in four tight sets and he's expecting a similarly taxing encounter in the fourth round of the Australian Open.

"It's going to be a tough match - he's got a big first serve, he's got a big game, he's got a huge forehand," said the Australian world No.1, who has yet to reach the last eight of his home grand slam event.

"I just have to go out there and play my game.

"If I execute as well as I can, I'm giving myself as good a chance as I can have."

The winner will meet one of the game's rising stars in the quarterfinals.

Ninth seed Andy Roddick is considered to be the future of the game in the United States, while Davis Cup final hero Mikhail Youzhny has a similar status in Russia.

Their fourth round clash will take place on Vodafone Arena.

The first night match on centre court will see in-form Belgian Kim Clijsters heavily favoured to beat South African Amanda Coetzer.

Clijsters has dropped only six games in her opening three matches.

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