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Tim Henman produced a thrilling fightback to keep his Wimbledon dream alive on Tuesday, battling back from two sets down to beat Jarkko Nieminen.

The British number one eventually triumphed 3-6 6-7 6-4 7-5 6-2 after three hours 31 minutes on Centre Court.

But afterwards he conceded he needs to make a massive improvement to have any chance of winning the title he covets so dearly at the 12th attempt.

"It was touch and go for a long time," the sixth seed said after his first such comeback at Wimbledon, the fourth of his career.

"I was struggling with my incompetence and needed to change that. I wasn't playing well and was flat with my attitude and body language.

"Physically I was really struggling to get some energy into the match, and the crowd probably the same.

"But you've got to keep fighting and play with what you have on the day.

"There wasn't so much but I'm proud of the way I dug in and found a way to get through."

Henman's compatriot Andrew Murray made things much easier for himself.

On his senior Wimbledon debut, the 18-year-old Scot recorded an impressive 6-4 6-2 6-2 victory over Switzerland's George Bastl, the man who ended Pete Sampras' SW19 career back in 2002.

Murray, built up as Britain's 'next big hope' tried to play down the media hype which will build following this latest win.

"I don't really mind it," he said. "It's a little bit over the top because I still haven't really done anything. I mean, I won the US Open juniors and I won a couple of matches at Queen's and now I've won a match here.

"So really it's only four or five matches and everybody's making out as if I've pretty much won Wimbledon. And I think it's a bit over the top."

Murray will next face 14th seed Radek Stepanek.

The biggest shock of the day was the defeat of Justine Henin-Hardenne, the ante-post favourite with many bookmakers.

The French Open champion was stunned by Greece's world number 76 Eleni Daniilidou, losing 7-6 (10-8) 2-6 7-5 on Court One.

Henin-Hardenne looked to be on her way back when she won the second set but Daniilidou raised her game again and despite missing two match points at 5-4, she steeled herself and clinched victory courtesy of one of numerous double faults from her Belgian opponent who tasted defeat for the first time in 25 matches.

Henin-Hardenne, who committed 48 unforced errors and eight double-faults, admitted: "It is very hard to win when you play like this.

"I had a hamstring injury which got worse and it was very difficult to get the rhythm I needed - it was a lot of things that made things difficult for me today."

She added: "If you face somebody in your first match who enjoys playing on grass it is pretty hard. It gets frustrating.

"You have to stay low all the time but you know you will have harder moments now and then.

"I'm sure I'll have good moments again but you cannot win all the time."

Unseeded Daniilidou, who has lost more than she has won this year, confirmed: "It is my surface.

"You have to go for it and sometimes you just miss easy shots but in the end I was really focused and I'm very happy to beat such a great player and a great talent."

Serena Williams avoided such a humiliation but she was given a major fright by fellow American Angela Haynes.

Playing out on Court Two - the famous 'champions' graveyard' - the two-time winner dropped the first set in a marathon tie-break which Haynes eventually took 14-12.

However, the fourth seed edged a tight second set 6-4 before racing through the decider 6-2.

In contrast, defending champion Maria Sharapova moved smoothly into the second round with a routine 6-2 6-2 victory over Spain's Nuria Llagostera Vives on Centre Court.

The 18-year-old Russian showed just why she has climbed to world number two since her fairytale victory at the All England Club 12 months ago with a display of power tennis, both from the baseline and when coming into the net to dispatch a succession of precision forehand winners which left her opponent with little chance of producing an upset.

The 18-year-old was happy with her form, but warned there was more to come.

"I think I can get a lot better form here. I did enough to win and am pretty satisfied," she said.

Two-time former champion Venus Williams also got her 2005 campaign off to a solid start.

She beat Eva Birnerova 6-2 6-4 out on Court Two, nicknamed the Champions' Graveyard given all the previous winners who have lost there in the past.

However, Williams did not add her name to the list, serving well as she posted the expected victory.

In the men's event, second seed Andy Roddick laid down an early marker with a straight-sets win over Jiri Vanek.

The big-serving Roddick had a little difficulty in the second set, which went to a tie-break, but he took it and marched on to a 6-1 7-6 6-2 victory.

Asked afterwards whether he was looking forward to another final clash with Roger Federer, Roddick said: "I have to get there. Maybe Roger can look ahead to the semis and final - but I have to get through my second round and so on.

"But I feel like I am playing as well if not better than last year."

Newly-crowned French Open champion Rafael Nadal, who many believe is capable of adding the Wimbledon title to his rapidly-growing collection, opened his campaign in blistering fashion.

He thrashed veteran American Vince Spadea 6-4 6-3 6-0.

Jane O'Donoghue gave the British women some much needed cheer.

She became the first British female into round two as she came from a set down to beat Germany's Anna-Lena Groenefeld 1-6 6-1 6-4.

"That was the best win of my career," beamed O'Donoghue, who has a world ranking of 232 - some 190 places lower than her opponent.

"I'm delighted to get through. All the hard work I've put in the last year is starting to pay off.

"(When I was a set down) I had nothing to lose, I just thought it can't possibly get any worse. I took my time and started to believe.

"I started to dictate to her instead of her dictating to me. Maybe if I do start serving well, who knows what can happen. I can't wait to get back out there and serve better."

But there was more misery for the host nation on the men's side as wild card Jonathan Marray lost in five sets for the second successive year.

The 24-year-old, who missed three match points against Karol Beck on his debut at the All England Club a year ago, went down 6-3 3-6 2-6 6-1 6-4 to 2002 semi-finalist Xavier Malisse.

The 24-year-old Briton, who led 3-0 in the final set, admitted that his mind flashed back to last year when he lost 10-8 in the decider to Beck but claimed he was able to take more positives from his latest defeat.

"Your mind does wander," he said. "I said to myself not to do what I did last year. Perhaps it's something I've got to learn, to keep my concentration better.

"But I'm a lot happier with my performance this year than last year. It was me who lost it last year but he won it this year. He stepped it up a bit in the fourth set and got the momentum.

"But I'm not feeling like I did last year. I didn't play my best and nearly won the match."

Amanda Janes also missed a chance before losing to 15-year-old Bulgarian Sesil Karatantcheva.

Janes held match point but eventually lost 7-5 6-7(6-8) 7-5.

But it wasn't just Brits going out though - several seeds also fell.

In the men's singles, 17th seed David Ferrer, Tommy Haas (19), Ivan Ljubicic (20) and Robin Soderling (30) all made their exits.

Less of a surprise was Wayne Arthurs' defeat of 32nd seed Filippo Volandri. The Australian could face Briton Tim Henman in round three.

Also bowing out was Queen's Club finalist Ivo Karlovic. He lost an epic battle of the big servers against Surbiton Trophy winner Daniele Bracciali, despite serving a record 51 aces in the match.

The Italian, who served 31 aces of his own, finally won 12-10 in the fifth set.

And in the women's, Ana Medina Garrigues went out to Katarina Srebotnik, Tatiana Golovin crashed to Alyona Bondarenko, while Francesca Schiavone (21) lost a thrilling battle against Kristina Brandi, going down 9-7 in the final set.

There were no such problems though for talented Russian Vera Zvonareva, the 11th seed coming from a set down to beat Marlene Weingartner.

Zvonareva's compatriot Nadia Petrova, seeded eight, also overcame a one-set deficit to progress.

Seeded French duo Mary Pierce and Nathalie Dechy also won.

Back on the men's side, French Open finalist Guillermo Coria, Thomas Johansson (12) and Nottingham Open winner Richard Gasquet all progressed to the last 64.