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Tim Henman eased into the last 16 at Wimbledon for the eighth year in succession with an easy win over teenager Robin Soderling.

Henman beat the 18-year-old Swedish qualifier 6-3 6-1 6-4 in just 93 minutes on Centre Court.

It could have been even quicker for the 10th seed, who was broken to love when he served for the match at 5-3.

Andre Agassi's title credentials were given a severe test - but he eventually came came through with flying colours.

The world number one was pushed all the way by Morocco's Younes El Aynaoui on Centre Court, but won through 5-7 6-4 7-6 7-6.

El Aynaoui's serve caused the second seed problems all day, but Agassi was able to get the better of the key moments in the match.

After dropping a tense first set, Agassi upped his game towards the end of the second, breaking his opponent for the first time in the tenth game to level the match.

The third set was again a tight one, serve holding sway until the tie-break where the first three points went against it to give Agassi a 2-1 advantage.

He held on to that to establish a two-sets-to-one lead.

Many thought El Aynaoui would then crumble, but the 27th seed had no intention of doing that, saving early break points in the fourth set.

And it looked as if he would take the match into a decider when he moved to three set points at 6-5 0-40 on Agassi's serve.

But Agassi came up with big plays on all three points to force another tie-break which was effectively decided by one point which saw El Ayanoui dump a forehand into the net.

Agassi clinched victory by taking the breaker 7-4 and booking a last-16 clash with another big server, Mark Philippoussis.

Afterwards Agassi said: "I had played two solid matches, felt comfortable getting over the hurdle in both, but I knew today I had to go out there and really execute.

"Because not only is Younes a talented player, but he knows how to win, he knows how to beat the best players and he believes he can.

"It was a good standard out there. I always enjoy playing Younes, he's frustrating at times but overall there's a lot of tactics going on out there on the court."

Philippoussis, the man nicknamed Scud, remains a serious threat to the bigger names in the draw after battling past Radek Stepanek.

The Australian, unseeded this year, had to fight hard to see off the 35th seed 4-6 7-6 6-4 7-6.

The 26-year-old, who has endured three knee surgeries, admitted: "If I'm healthy, I'm dangerous. My strength will build up. I'm feeling good on the court. I know good things will come."

As for winning Wimbledon, though, he stressed: "I just like to take each day as it comes, and not set myself a goal like that."

In the women's singles, teenage sensation Maria Sharapova knocked 11th seed Jelena Dokic out of Wimbledon with a stunning 6-4 6-4 win.

The 16-year-old Russian star, who burst on to the scene at Edgbaston earlier this month, was in supreme form on her serve, slamming down eight aces.

Dokic, a former semi-finalist, was unable to break her delivery all match and after dropping her own serve at crucial times, Sharapova was able to win this battle of the pin-ups.

The Serbian lost her serve in the very first game of the match, putting her on the back foot from the off.

It proved decisive and despite Dokic holding break back points at 4-5, she was unable to do so.

Sharapova kept hitting the lines with compelling regularity and broke again when Dokic collapsed at 2-3, losing her serve to love.

Sharapova will now fancy her chances to going further with a match against compatriot Svetlana Kuznetsova next up.

She said: "This was definitely one of my biggest wins but the main thing I did was force her to make mistakes.

"She's a hard-hitter and I knew I would have to work hard but when I come into a tournament I expect to win - that's my philosophy.

"It is no good thinking you are going to get your ass kicked and so you might as well go home.

"I've worked hard with my father and a tough coach and I know one day it will pay off, like wow. But, yes, I am a bit surprised to be this far."

Despite being ousted, Dokic was not convinced that Sharapova could go on to win the title, saying: "She played well but I think she has a long way to go to win it here.

"The next year will tell whether she can make the top 10 but against people like Serena and Venus (Williams) I don't see her as a favourite."

Kuznetsova, a former world junior number one, easily beat France's Emilie Loit 6-1 6-2.

Defending champion Serena Williams is a possible semi-final opponent for the youngster but she looks in no mood to relinquish her grip on the famous Venus Rosewater Dish.

The top seed brushed aside the challenge of Laura Granville on Court One, winning 6-3 6-1 and afterwards she was delighted with her form.

"I think I'm serving very well," she said. "I don't like double faults. I hate giving away points like that.

"My second serve was pretty fast and I was pleased with the way I moved. I'm moving better.

"It was definitely my best performance, for sure. If I had played the way I played in the first and second round, it would have been tougher."

Next up for Williams is 15th seed Elena Dementieva who also raced into the last 16 for the last of just four games.

The Russian number two had no problems against Hungarian Aniko Kapros, winning 6-3 6-1.

Dementieva dominanted proceedings on Court 18, breaking her opponent's serve no less than five times.

Kapros did put up some resistance in the first set, breaking Dementieva for the one and only time, but once the Russian took the set, it was all plain sailing for her.

The Russians continued to fly through the draw with Anastasia Myskina joining Sharapova and Dementieva in the next round.

Tenth seed Myskina put paid to former champion Conchita Martinez's hopes with a 6-3 6-3 win.

Myskina will face seventh seed Jennifer Capriati next after she beat Japan's Akiko Morigami 6-4 6-4.

There were winners from other countries apart form Russia.

Former French Open champion Mary Pierce continued her impressive run with a nail-biting win over 23rd seed Lisa Raymond.

Pierce, who has endured a miserable few years due to injury, edged a tight battle 7-5 in the final set - and then revealed she had considered not even playing in SW19.

"I wasn't sure about coming to Wimbledon at all," admitted Pierce.

"I didn't want to go and play another tournament the way I did in Paris. It just wasn't an option for me.

"But I spoke to my coach and we looked at the way the ranking system works and my rehabilitation as a whole and decided it was a win-win situation.

"Once I made the decision to come I felt very positive and while physically I am still not at my best, it's very special to come here and win a few games."

French Open champion Justine Henin-Hardenne is next for Pierce.

The 21-year-old Belgian beat Australian Alicia Molik 6-4 6-4, holding her serve throughout.

She was certainly happy with her form heading into the second week.

"It was a tough test for me because she served so well. I'm very happy that I finally found my game today," said Henin-Hardenne.

Back in the men's event, the likelihood of a German following in the footsteps of Boris Becker and Michael Stich at Wimbledon moved from slim to possible when Alexander Popp progressed into the fourth round.

Little has been heard of the 26-year-old who shocked many by reaching the last eight on his only other visit to the All England Club in 2000.

That is until now. Having battled back from a long-term ligament injury, Popp ousted 11th seed Jiri Novak in straight sets on Saturday to get German fans just a little excited.

With a last-16 meeting against Olivier Rochus to follow, Popp must be beginning to wonder whether a remarkable win such as Stich's 1991 triumph is indeed a possibility.

Always in control against Novak, Popp strolled to a 6-3 6-4 7-6 win.

His only problem came when serving for the match at 6-5 in the third.

Czech star Novak broke back to stay alive but Popp went on to take the tie-break 7-3 to move through.

Popp, whose mother hails from Wolverhampton and holds a British passport himself, had hinted he could turn out for Britain one day when he reached the quarter-finals three years ago.

But after this clash he ruled that out saying: "I've been playing for Germany for the last 26 years and it doesn't look like it's going to change.

"I feel English a little because my mum's English and we speak English at home sometimes.

"I feel at home when I am here. I have a lot of relatives here and a part of me is English, that's for sure. But I grew up in Germany."

Rochus also dispatched a seed as he set up the clash with Popp.

The Belgian, who beat Marat Safin here last year, was a straight-sets winner against 30th seed Jarkko Nieminen.

After edging a tight opening set in the tie-break by seven points to five, Rochus waltzed to a 7-6 6-3 6-1 victory.

In the early evening sun, 13th seed Sebastien Grosjean ended qualifier Wesley Moodie's run with a four-set win.

Grosjean will play Juan Carlos Ferrero on Monday.

The French Open champion is looking to become the first person since Bjorn Borg in 1980 to complete the double of winning at both Roland Garros and Wimbledon in the same year.

He remained on course to do so with a 6-4 6-4 2-6 6-4 win over Sargis Sargsian.

Last year's beaten finalist David Nalbandian completed the singles fourth-round draws with a late five-set win over Karol Kucera.

Nalbandian could have made life a lot easier for himself had he cleaned up the second and third sets having taken a 4-1 lead in both.

Instead, he allowed Kucera to fight his way back and sweep in front after losing the opening set.

And, when Nalbandian lost his temper and his serve at the start of the fourth after a series of close line calls went against him, a shock looked on the cards.

However, somehow the Argentinian managed to recover his composure to level the match and, taking maximum advantage of Kucera's obvious ankle injury, which required the attention of the physio on two occasions and ended up being heavily strapped, scrambled home 6-4 5-7 6-7 6-4 6-2 despite again finding himself a break down in the decider.

He faces Henman next.