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Tim Henman clung onto his Wimbledon dream after twice coming back from the dead in a five-set fourth round epic with Michel Kratochvil.

Henman stared embarrassing defeat against an unseeded opponent in the face at one set and one break down in the third set - then again recovered from an early break in the decider.

He completed his 7-6 6-7 4-6 6-3 6-2 triumph by raising his arms to the heavens, his mini tennis miracle complete.

The British number one was indebted to a huge unforced error count from the Swiss world number 45 - who came up with an extraordinary 17 double-faults.

Henman's crucial break came in the fifth game of the final set when he grabbed his third break point chance to go 3-2 ahead.

It capped a dramatic turnaround after Henman netted an easy forehand to go 2-0 down three games earlier.

But as the winning post approached Henman, so often accused of choking at important moments, launched into overdrive.

He needed only one chance to take a double break and served out to complete his breathless victory.

A clearly relieved Henman said: "I've no idea how I won.

"I had a problem with my stomach just before the rain break and I was happy to go off. I did not feel very good and hoped it would keep raining.

"I did not have a lot of energy and suddenly when we came back I lost seven out of eight games and was down a break in the fourth. I don't know who kept me alive but the crowd can take a lot of credit."

Henman's compatriot Greg Rusedski was left facing a nerve-wracking wait after his fourth round clash with Belgium's Xavier Malisse was suspended due to bad light.

Malisse had just levelled the match at two sets all when play was called off for the evening shortly before 2100 BST on Centre Court.

The British number two was probably grateful for the interruption after his fifth double fault had gifted the 27th seed the chance to level the match.

The 21-year-old duly did, and moments later tournament referee Alan Mills came on court and consulted the players before calling off play with the match perfectly poised.

Lleyton Hewitt continued his serene progress towards a possible semi-final clash with Tim Henman with another straight-sets victory at Wimbledon on Monday.

The men's singles top seed defeated Russian Mikhail Youzhny 6-3 6-3 7-5 in the fourth round on Centre Court and has yet to drop a set in the championships.

Youzhny had taken a set off Hewitt during his second round defeat to the Australian at a grass court event in Holland the week before Wimbledon, before Hewitt, the defending champion there, pulled out of the tournament with a stomach virus.

The 20-year-old Russian was showing glimpses of that ability with some flashing backhands, but Hewitt's blistering pace around the court made him difficult to beat from the back of the court.

Ironically two backhand errors finally proved his downfall as he was broken in the 12th game of the third set to give Hewitt victory and a place in the last eight.

Hewitt was pleased to get another straight-sets victory under his belt and is not worried about not being seriously tested so far this fortnight.

"I've had a few tight sets and had to come through in pressure situations and I feel good," said Hewitt.

"I've played some tough sets but have not lost a lot of energy which is good.

"Youzhny is a good player, I was expecting a tough match and I'm happy to get through in straight sets, he was getting better and better as the match went on."

Hewitt faces Holland's Sjeng Schalken next.

The Flying Dutchman's impressive progress through the draw continued as he destroyed Jan Vacek 6-2 7-5 7-5.

David Nalbandian saw off the big-serving Wayne Arthurs to cause another shock in SW19.

Seeded 28, Nalbandian edged the pair's fourth-round clash, winning in four sets, 6-2 7-6 (7-4) 2-6 7-6 (9-7).

He will now face Nicolas Lapentti for a place in the semi-finals.

That match will produce Wimbledon's first-ever South American semi-finalist.

Lapentti's Wimbledon adventure continued as he beat Arnaud Clement in five thrilling sets.

Clement, who had not dropped a set before this match in the championships, led 6-3 5-7 6-2 but Lapentti fought back.

The Ecuadorian took the fourth set 7-5 and went on to clinch victory in the fifth 6-3.

Lapentti clearly likes the surrounbdings of the All England Club for it was here that the 22nd seed beat Greg Rusedski in a Davis Cup tie two years ago.

Little-known Andre Sa ensured there will be an Andre in the last eight.

The crowd may be more used to seeing Andre Agassi at this stage, but they will have to put up with the Brazilian this year as he beat Spain's Feliciano Lopez in four sets. He is Tim Henman's opponent in the next round.

The remaining fourth-round match between Mark Philippoussis and Richard Krajicek was held over until Tuesday.

Defending ladies' champion Venus Williams was the first player into the quarter-finals of Wimbledon when she crushed doubles expert Lisa Raymond.

Williams dropped just three games as she raced to a 6-1 6-2 win on Court One.

She will now face the unseeded Elena Likhovtseva who ousted Magdalena Maleeva.

The Russian, who knocked out Britain's Elena Baltacha in the third round, won their tussle in straight sets 6-3 6-4.

Williams, whose left knee was again heavily bandaged, said she had no problems with the injury and insists her best is yet to come.

"I'm just trying to improve as the tournament goes on," she said. "I'm trying to keep my unforced errors down and play controlled tennis.

"It was nice that I played well to get to the quarter-finals. I wasn't moving as well as I could and I'm trying to get myself moving."

Sister Serena later joined Williams in the quarter-finals.

She was held up by rain - the first of this year's tournament - but it couldn't stop the French Open champion from beating Eastbourne winner Chanda Rubin in 6-3 6-3.

Williams, always critical of her own performance, said: "There is always room for improvement. I think I missed too many returns when she served out wide.

"I'm really having fun but the second week is when you have to buckle down and get serious.

"Venus picks up her game in week two and if I'm going to be able to keep up with her I'm going to have to pick up my game too."

Serena now faces 11th seed Daniela Hantuchova.

Hantuchova beat seventh seed Jelena Dokic 6-4 7-5.

Fourth seed Monica Seles, held up for two hours by the rain, made up for lost time by racing through her fourth round match with Tamarine Tanasugarn.

The nine-times Grand Slam champion, who looks determined to add Wimbledon to her impressive list of honours, took just 48 minutes to secure a 6-2 6-2 victory and set up a quarter-final with sixth seed Justine Henin.

Henin, last year's beaten finalist, overcame Russia's Elena Dementieva 7-6 7-6.

Amelie Mauresmo continued to impress as she dismissed Laura Granville in comprehensive fashion.

The American had no answer to the ninth seed's power and succumbed 6-2 6-2 in just 52 minutes.

Mauresmo blasted 20 winners to her opponent's six and now faces either Jennifer Capriati or Eleni Daniilidou in the last eight.

Their last-16 match, the last of the fourth round, saw third seed Capriati win the first set but drop the second before play was halted with the third set yet to start.

The players will resume their match on Tuesday with a shock result a serious possibility.