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Little-known Croatian teenager Mario Ancic dumped seventh seed Roger Federer out of Wimbledon in a Centre Court stunner on Tuesday.

Last year, Swiss ace Federer stunned seven-time champion Pete Sampras in the fourth round.

But the man tipped to be champion by John McEnroe was the victim this time in a match he was expected to cruise through.

Ancic won 6-3 7-6 6-3, raining down big serves on his bewildered opponent and volleying like a veteran grass-courter.

He sealed victory, the most shocking of the tournament so far, when Federer flayed a forehand wide into the tramlines.

"I didn't care who I played, I just went out there and played," said thrilled Ancic.

"I knew how he was playing but did he know how I was playing? That was my advantage."

Federer admitted he was "hurt" by the setback and would examine his performance to discover how it happened.

"I'm still looking for reasons why I played so bad. I'm terribly down," he said.

"I expected more than coming here and losing in straight sets."

The 20-year-old was a 7-1 shot to lift the title on Sunday week, but he admitted to coming into the match almost blind to Ancic's threat.

"I knew he was young and I didn't know much more," he conceded.

"I tried to get some information from other players. I got my information and didn't really figure out his game today."

Tim Henman could not have asked for an easier opening match than his straight sets victory over Jean-Francois Bachelot, a game so one-sided that the Court One crowd were trying to encourage the Frenchman in order to keep Henman on court a bit longer.

The British number one however looked like a man with a plane to catch, and completed a ruthless 6-1 6-3 6-2 victory with the minimum of fuss.

Maybe it was his determination to spare his pregnant wife Lucy from the kind of rollercoaster of emotions sometimes associated with matches Henman is expected to win comfortably.

Either way, it was encouraging to see a thoroughly professional demolition job from the 27-year-old against an opponent who reached the semi-finals of the junior competition here in 1995 and had battled through three rounds of qualifying.

"If I can keep the matches of that nature I'm sure Lucy will appreciate it," said Henman, who will face another qualifier, Australian qualifier Scott Draper in the second round.

"The first round can sometimes be a little bit tricky but I got off to a great start and continued with that pretty much throughout," Henman said.

Australian Open champion Thomas Johansson added to the shocks when he made his exitr at the hands of Brazilian Flavio Saretta.

The eighth-seeded Swede - widely regarded as a quarter-final opponent for Tim Henman - won the first set 7-2 on the tie-break but was in trouble after losing the next two sets 6-4 7-6 (7-4).

However, he regained his composure to square the match by winning the fourth set 6-3 - and saved several match points in the fifth set.

But plucky Saretta held his nerve to complete a 12-10 success.

"It was maybe the best match I've played in my life," said Saretta.

"Now I can believe a little more than I did yesterday.

"I think I played a very good match today. I feel a little bit tired, that's normal when you play four hours."

Johansson was certainly in no mood to laugh as he admitted: "If I play like I did today I would lose to most of the players in this tournament.

"But he played well and deserved to win. I saved a few match points and had 0-40 at 10-10 to break and serve for the match but I did not convert the break points so good today."

There were no such problems for number one seed Lleyton Hewitt who looked every inch a future Wimbledon champion as he eventually destroyed Jonas Bjorkman 6-4 7-5 6-1.

The toughest of first round challenges was a blistering war for two sets and the rivals traded blows with thrilling precision.

However, by the third, Bjorkman was almost on his knees, unable to keep pace with the 21-year-old Australian, who was content to stay at the back of the court and unleash a series of stinging returns to which his opponent had no answer.

Hewitt admitted he was delighted to have made such a solid start to his campaign having come up against a tough opponent.

"I knew I had to be on my game because Jonas won at Nottingham last week and he was going to be confident," said the number one seed.

"It was probably the toughest first round draw around, so I couldn't be happier to get through."

Hewitt also claimed he didn't have to adopt serve and volley tactics to win the tournament, even it has generally been seen as the best way to win on grass.

"I can win Wimbledon from the back of the court," he said.

"Andre Agassi was able to do it, although it is going to take a lot of effort."

Another baseliner, Spain's Juan Carlos Ferrero also moved into the second round.

Ninth seeded Ferrero avoided an upset against South Africa's Neville Godwin.

The 22-year-old lost the first set but came through a two-hour 38-minute clash 6-7 (5-7) 6-3 6-3 6-3.

Earlier, Venus Williams predictably battered her way past Briton Jane O'Donoghue on Ladies' Day.

The defending champion dropped just two games as the British number seven had no answer to her powerful game.

It was no surprise to see Williams triumph 6-1 6-1 and she next faces Virginie Ruano Pascual, who beat Martina Hingis last year.

O'Donoghue said the experience had whetted her appetite for the big occasion.

"I felt I did myself justice," she said. "I was up against the best player in the world and I thought I did quite well.

"Venus served quite well and I struggled to make a lot of returns but I enjoyed every minute of it."

O'Donoghue said the experience had whetted her appetite for the big occasion.

"I felt I did myself justice," she said. "I was up against the best player in the world and I thought I did quite well.

"Venus served quite well and I struggled to make a lot of returns but I enjoyed every minute of it.

"Ten minutes before I went on court I had a lot of butterflies, which was understandable, but once I hit my first few balls I settled down.

"It's a place everybody wants to play and, now I've had a taste, I want more of it."

Williams paid tribute to the 19-year-old from Wigan and tipped her to break through into the top 100.

"To be honest, she played very well," said the champion. "I could see she had a game plan. She came to play aggressively and take her opportunities.

"But I'm so comfortable on grass. I've had a lot more experience and that's what really counted. I'm used to a player coming out and playing 100 per cent against me."

Rachel Viollet was another Brit to tumble out. She won just one game as she lost 6-1 6-0 to Bulgaria's Magdalena Maleeva.

Injury was added to insult for Hannah Collin, whose bid to reach the second round also failed.

Collin suffered a leg injury in the final set against Emanuelle Gagliardi as she went out 1-6 7-6 (7-4) 2-6.

But battling 18-year-old Elena Baltacha prevented British women's tennis from hitting rock bottom on Tuesday.

Only her hard-fought 6-4 6-4 victory over 28-year-old Venezuelan Maria Vento-Kabchi prevented the home country from failing to have a representative in the second round of the women's singles for the first time in the history of the championships.

But it was a close call for Baltacha, ranked 295 in the world, against a person 116 places above her in the charts.

Only the fighting spirit of the Kiev-born player, raised in Scotland after her footballer father Sergei was first transferred to Ipswich from the Ukraine, prevented Britain's female contingent from becoming a far from magnificent seven.

Baltacha finally gave the British fans on Court 18 something to cheer.

"I just kept fighting and trying to get the win," said Baltacha, who joked her victory "saved the day".

She continued: "I was so nervous but I just kept on fighting and managed to get a win.

"I did not play my best tennis but a win's a win. In the first set I was all over the place. I really had to concentrate hard.

"I don't think she had a great game. I served big on the important points and that got me out of jail."

Meanwhile, Kim Clijsters looked far from potential champion material as she struggled to overcome her first obstacle.

The Belgian fifth seed, who reached the last eight last year, showed little willingness to attack the net and struggled with her serve.

She beat American Samantha Reeves 6-2 7-6 (7/5) on Court 18, but was often outrallied as she spent much of the 90-minute match behind the baseline.

Clijsters admitted she is still striving to recapture her best form due to the lingering effects of an arm injury.

"It's been a very tough year for me," she said. "I did not play my best tennis but it was good enough to go through, that's most important.

"The injury is still there and I'll have another MRI scan after Wimbledon. I'll see how it goes. It's been getting better slowly.

"I feel physically stronger than before the injury. I served well today, better than I was doing before my injury."

Clijsters' fellow Belgian Justine Henin, last year's beaten finalist, had a similar struggle.

She survived a second set scare and a serving nightmare to reach the second round.

The 20-year-old sixth seed dug herself out of a hole to beat American Brie Rippner 6-2 6-7 (4-7) 6-1.

Henin blamed her inability to finish off Rippner in the second set on her two-week absence through illness following the French Open.

"In my tournament last week I had some problems to finish the match and maybe I was thinking about that.

"But my goal today was to win, that was the most important thing for me. Finally I was happy to finish the match," she said.

Former finalist Monica Seles had few problems though despite suffering from a cold. She was unmerciless as she overpowered unseeded Spaniard Eva Bes 6-0 6-0.

The 28-year-old Seles, who lost to Steffi Graf in the 1992 final, was back to her grunting best as she demolished the 29-year-old Bes, who will remember her Wimbledon debut for all the wrong reasons.

"I definitely wouldn't be out here if I didn't think I could still win another Grand Slam," said Seles. "That's one thing that drives me.

"Realistically, this is the tournament I have the least chance but I really enjoy playing here. When the weather is like it is today, it definitely suits my game."

Women's 16th seed Lisa Raymond was another early winner.

Doubles expert Raymond, who is in Venus Williams' 16 in the draw, had no problems dispatching Katarina Srebotnik of Slovenia.

Raymond, who likes to play on grass, emerged a 6-4 6-2 winner in 68 minutes.

She was joined in round two by tenth seed Silvia Farina Elia and Elena Dementieva, seeded 12.

Dementieva saw off Bianka Lamade 6-4 6-3, while Farina-Elia beat America's Amy Frazier, 7-5 4-6 6-4.

But 15th seed Anna Smashnova lost out to the reigning junior Wimbledon champion, Angelique Widjaja.

The 17-year-old from Indonesia was in dominant form with the grass under her feet once more.

Once Widjaja had raced into a 4-0 lead, Samshnova, of Israel, was never in the match and the youngster went on to record a 6-3 6-2 win.

In the men's singles, Younes El Aynaoui became the highest seed so far to fall.

The 13th seed, crashed out to Irakli Labadze.

Labadze finally won a tight tussle 4-6 7-6 (7-4) 6-3 7-6 (7-2) out on court eight.

Earlier Tommy Robredo was the first seed to fall on day two.

The Spanish baseliner, who reached the semi-finals at a warm-up event in Holland last week, was blown away by Dutchman Raemon Sluiter.

Sluiter laid down the law early on, winning the first set 6-1 and Robredo was unable to recover.

He lost the following two sets 6-4 6-4 to make an early, if not too unexpected, exit.

Slutier had reached the semi-finals at Queen's Club just ten days ago and could well go further on current form.

Robredo was joined on the seed casualty list by Paola Suarez, the 28th seed.

The claycourt specialist was beaten by American Jill Craybas 6-4 5-7 7-5.

Nicolas Escude survived the 'graveyard', a stomach injury and a brave challenge from teenage Brit Alex Bogdanovic as he went through.

Court Two's reputation is as a scene of countless upsets, and 16th seed Escude appeared deep in trouble when he lost the opening set to the world number 491.

He eventually emerged a 4-6 6-4 6-4 6-4 winner.