Melbourne: Jelena Jankovic powered into her third career Grand Slam semi-final on Tuesday as she dismantled defending title holder Serena Williams 6-3, 6-4.

The smiling Serb third seed has now reached the final four in Melbourne, New York and Paris since 2006. The win - marred by 10 breaks of serve - boosted her record against Williams to 3-2. "I'm surprised," said the delighted winner, "It was an unbelievable match, I'm still shaking. I'm really so happy to be in the semis here for the first time. I came here with expectations."It's amazing to beat the defending champion and in general a champion like Serena.

"This doesn't happen every day, I'm glad to get another win against her."

Williams, who reportedly smashed a racket during practise earlier in the day, was never on her game, holding serve a mere three times.

The American also handed over a fifth double-fault for a Jankovic match point, which the Serb converted as Williams sprayed a forehand wide after one hour, 39 minutes of pure frustration ended by a 34th unfolded error.

Williams, managed to lose serve in the fifth game for the first set and did it again to drop the opener after 35 minutes.

At one end of the court, she was bothered by the sun while serving, which wouldn't have helped the mood of a woman who smashed a racket along the way.

Jankovic got off on a tear in the second set with a break for 2-0 but lost the edge a game later finally grabbing a 3-1 lead during a run of four consecutive breaks.

After breaking Williams for 3-2, Jankovic called for the trainer to treat a left upper thigh, among a run of injuries she has dealt with this month which have included a glute muscle, lower back, quad and neck.

Not to be outdone during the time-out, Williams called for treatment on some blisters.

Jankovic took a 5-3 lead with another break of Williams, the sixth of the error-strewn set, and claimed victory a game later.

"I'm going through pains," admitted the Serb. "But I try to forget them on court. I act like I'm in good shape. But I'll feel like new again when I play in two days, (against the winner from Maria Sharapova and Justine Henin)."

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