Kim Clijsters stopped Martina Hingis in her tracks at the French Open, out-hitting the Swiss in a 7-6 6-1 quarter-final win.

The Belgian also knocked Hingis out of the Australian Open quarter-finals in January and once again her greater weight of shot counted for more than her opponent's tactical nous.

Czech teenager Nicole Vaidisova dazzled Venus Williams to storm into her first grand slam semi-final with a 6-7 6-1 6-3 victory.

She will play Svetlana Kuznetsova in the last four after the 2004 US Open champion recovered from an atrocious start to beat fellow Russian Dinara Safina 7-6 6-0.

On her 23rd birthday twice runner-up Clijsters will face either defending champion Justine Henin-Hardenne or German Anna-Lena Groenefeld in the semi-finals.

If she wins, she will reclaim the world number one spot from Amelie Mauresmo, beaten by Vaidisova in the previous round.

Former world number one Hingis, who is back on tour after a three-year career break, was playing for a fifth consecutive day at Roland Garros which endured a rain-hit first week.

The 25-year-old, seeded 12, double-faulted to lose her first service game and trailed 5-2 in the first set. She battled back to force a tiebreak but Clijsters, the US champion, took it 7-5 with a backhand pass.

Hingis, who won a title for the first time since her comeback in Rome last month, faded away in the second set under a barrage of winners.

Clijsters needed only 22 minutes to wrap it up, sealing victory when Hingis mis-hit a backhand long.

"I knew I had to improve my game and step it up a level," said Clijsters.

"It was very close (in the first set) and a lot of fun to be out there today."

Vaidisova's win mirrored her shock quarter-final victory over top seed Mauresmo when she also lost a tiebreak before dominating the next two sets.

The German-born Czech turned 17 only in April and if she wins the title she will become the second youngest winner of the French Open behind Monica Seles, who was 16 when she won the claycourt grand slam in 1990.

"I'm so excited I could just scream now," gasped the teenager, whose best previous run at a grand slam was reaching the US Open fourth round last year.

A product of the Nick Bollettieri academy in Florida, Vaidisova was able to match the fearsome power of 2002 runner-up Williams, the reigning Wimbledon champion, and should have won the first set when she led 4-1 and then 5-2 in the tiebreak.

An errant forehand gave it to Williams but, as against Mauresmo, the setback merely spurred Vaidisova on.

She ran through the second set and dominated the third, sealing victory when Williams slugged a forehand long.

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