Lleyton Hewitt, Dinara Safina and Ana Ivanovic crashed out of Australian Open in Tuesday's round one, while Rafael Nadal, Kim Clijsters, Vera Zvonareva, Samantha Stosur and Shuai Peng advanced to the second round of the tournament.

World No. 1 Spanish Nadal spent only 46 minutes on court in his first round match against Brazilian Marcos Daniel, who retired with a sore knee and an equally painful 6-0 5-0 scoreline.

"It is difficult to say something, to say I played really well or I played bad," Nadal told reporters in Melbourne after the match on Tuesday.

"I played some good shots, some long shots, but the serve can be a little bit better.

"I can improve in everything for sure, but the only thing I feel I have to improve more if I want to play well here is the serve."

Nadal will play American qualifier Ryan Sweeting in second round, as he targets the "Rafa Slam", the first time one man has held all four major titles since Rod Laver in 1969.

In contrast, Argentine David Nalbandian completed a jaw- dropping 3-6, 6-4, 3-6, 7-6(1), 9-7 victory to former World No. 1 Australian Lleyton Hewitt in a match that lasted four hours and 48 minutes.

"It was a very tough first round we both know it, every time we play it's long matches, tough ones, he's a real fighter," Nalbandian said after the match.

"Cramping was around all the time, he was too tired as well. I played the two match points, I play incredible, serve and volley, it was amazing, and then after that the match was for both. I can win, I can lose, the match was very close."

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