PARIS (AFP) Samantha Stosur of Australia stunned four-times former winner Justine Henin at the French Open on Monday to wreck hopes of a dream quarter-final between the Belgian and top seed Serena Williams. It was the first time that Henin had lost since the second round in 2004, a 24-match unbeaten run that was the third best on record and it put a spoke in the comeback trail she has been blazing since the start of the year. It was also the second straight year that the fast-rising Gold Coast resident Stosur has reached the last eight in Paris, having lost in last years semis to eventual winner Svetlana Kuznetsova of Russia. Going into a quarterfinal, I couldnt probably hope to be in a better position, I dont think, the Australian said. Obviously beating Justine is going to give me lots and lots of confidence for the next match. The other quarter-final in the top half of the draw will see fourth seed Jelena Jankovic of Serbia take on Yaroslava Shvedova of Kazakhstan, the first player from that country to reach the last eight of a Grand Slam. In sharp contrast to the Henin-Stosur thriller, which the Australian won 2-6, 6-1, 6-4, Williams breezed past Shahar Peer of Israel 6-2, 6-2. The American insisted she was not shocked by Henins dismissal. Henin missed the 2008 and 2009 French Opens after retiring in May 2008 claiming that she had lost all motivation and wanted a change of lifestyle, but returned to action at the start of the year in Australia. She quickly jumped out into a 2-0 lead and a second break of serve in the seventh game allowed her to pocket the opener 6-2 in just 32 minutes. But just when it looked like the Belgian was heading for a straightforward win, Stosur, who is ranked a career-best seventh in the world, upped her game. She turned on the power with her serve to edge ahead and then stunned Henin with an array of attacking shots that left the Belgian shaking her head in frustration. Stosur pocketed the second set and she stuck with her gameplan to go for her shots and attack the net at every opportunity in the decider, with Henin looking to lure her into a battle of baseliners. Games went with serve until 2-2 when an increasingly uncomfortable-looking Henin failed to convert two points for a 3-2 lead and then double-faulted to hand the break to the Australian. Stosur had the initiative with her own usually reliable serve to follow, but she promptly played a poor game allowing Henin to claw her way back into the match at 3-3. She was handed a second chance though three games later when Henin dished up three unforced errors and a double fault allowing the Australian to take a 5-4 lead. This time she gleefully accepted it, finishing off the Belgian on her second match point. Henin said that she had felt more nervous and uncomfortable on court than usual having played for five straight days because of a succession of rain delays. The only trouble Williams had against Peer came right at the start when she dropped the first seven points of the match as she struggled to get to grips with the cold, blustery conditions out on the Philippe Chatrier centre-court. But she promptly won the next nine as she moved up the gears and then broke Peer for a second time to take a 4-2 lead. From there she coasted through, her serve and ground strokes far too heavy and penetrating for the Israeli. The win kept alive the Americans hopes of winning the French Open for just the second time, eight years after her first triumph, and also kept her on track for the fabled calender year Grand Slam having won the Australian Open title in January. Jankovic easily saw off the challenge of Slovakias Daniela Hantuchova winning 6-4, 6-2, while Shvedova beat Australian Jarmila Groth 6-4, 6-3. Meanwhile, Rafael Nadal insists his perfect record of six wins in six meetings against Nicolas Almagro will count for nothing when the two Spaniards meet in the French Open quarter-finals on Wednesday. Four-time champion Nadal, who is bidding to become only the second man in history after Bjorn Borg to win five or more Roland Garros crowns, has dominated his compatriot in their six-year rivalry. The world number two also dropped just three games to Almagro when they met at the same stage of the French Open in 2008. However, on the clay of Madrid two weeks ago, Almagro, the 19th seed here, took the first set off Nadal in their semi-final meeting. Nadal, with his 24th birthday being celebrated on Thursday, is aware that Almagro has altered enough as a player to be able to gatecrash the party. Its going to be very difficult, because the way he plays is really excellent, said Nadal, who has reached the last eight without dropping a set, and on Monday achieved his 200th career claycourt win by seeing off Brazils Thomaz Bellucci in the fourth round. Its going to be complicated; hes going to be very aggressive. As far as Im concerned, Ill try and play my way and do my best so that he feels a bit uncomfortable. Almagro, playing in his second French Open quarter-final, reached the last eight by defeating countryman Fernando Verdasco in the last 16 having almost slumped to a first round defeat when he lost the first two sets against Dutch journeyman Robin Haase.