Maria Sharapova reacts after winning a point against Justine Henin during their quarterfinal match at the Australian Open today. Sharapova won 64-60.

MELBOURNE, Australia — Maria Sharapova ended No. 1 Justine Henin's 32-match winning streak and defending champion Serena Williams was ousted by Jelena Jankovic before losing her doubles match.

Fifth-ranked Sharapova toppled Henin 6-4, 6-0 today to advance to the Australian Open semifinals for the fourth straight year.

Williams, who beat Sharapova in last year's final, lost 6-3, 6-4 to Jankovic, then teamed with sister Venus to lose their doubles match 3-6, 6-4, 6-2 to Yan Zi and Zheng Jie of China.

Sharapova lost to Henin at the season-ending championships in Madrid two months ago in one of the longest women's tour matches — 3 hours and 24 minutes — and had a 2-6 record against the Belgian.

"I came into the match really prepared to play a three- to four-hour match," Sharapova said.

Instead, she came out hot on a cool night, constantly putting pressure on Henin and refusing to wilt when things got tight.

"It's just incredible," Sharapova said. "I think it was one of the most consistent matches where I did all the things I wanted to do. I had to be aggressive. When I'm playing well, that's what I do. I want to be the one that's forcing their errors. I did a really good job of that today."

On the men's side, second-ranked Rafael Nadal had a 7-5, 6-3, 6-1 win over No. 24 Jarkko Nieminen of Finland, making the semifinals for the first time in four trips to the Australian Open.

The only player to beat Roger Federer in the past 10 Grand Slam tournaments, Nadal will face unseeded Jo-Wilfried Tsonga, the surprise of the tournament so far, who ousted No. 14 Mikhail Youzhny 7-5, 6-0, 7-6 (6).

Jankovic was seeded third and Williams seventh, so technically, her victory wasn't an upset. Despite her rise in rise in the rankings, she has never reached the final of a Grand Slam, while Williams seemed to be close to the form that she once used to dominate women's tennis.

Suddenly, gone were Williams' chances of defending her title. Gone were images of her spryly sprinting on the court in her first four matches, clearly leaner and fitter than last year, raising questions whether anyone could beat her.

Instead, the last memories will be of Williams struggling, of smashing her racket — bashing it twice when, like on so many points this day, she just didn't use enough power to finish it off.