"We know how tough it is to win Grand Slams, it's a long way," he added.

It was a sorry end for Williams, who was desperate to claim her first title at Melbourne Park to add to her four Wimbledon and two US Open crowns.

Ivanovic, 20, overcame the American eighth seed in a ferociously contested 7-6 (3), 6-4 thriller, and credited the crowd on center court and her improved fitness for helping her into the last four for the first time.

Switzerland's Roger Federer pumps his fist during his quarter-final match against James Blake of the U.S. at the Australian Open tennis tournament in Melbourne January 23, 2008. [Agencies] "It was an amazing match, we had lots of long rallies, she's an amazing competitor and she was also playing very well today," the 20-year-old fourth seed said after posting her first win over Williams in four attempts.

"I'm just so happy I pulled through the whole two sets.

"Most of all I'm thrilled that it happened here because I just love playing here and I'm so comfortable here on court."

Williams played with her left thigh heavily strapped, but gave credit to her opponent. And she defiantly vowed to bounce back.

"I have full expectations and aspirations to continue to play high-quality tennis and to continue to be a champion," she said.

Ivanovic will play ninth seed Hantuchova, ensuring at least one player in the final on Saturday will be contesting their first Australian decider.

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