Argentina's Juan Martin Del Potro is knocked out by Lleyton Hewitt [AFP]

Hardly a surprise, as the worlds' fifth best player has never been beyond the second round in SW19, but he would've expected more after his impressive run to the Roland Garros semi-finals.

If he wants to make any impact on the top four, he will certainly have to improve his game.

Hewitt, somewhat a waning force on the men's tour, produced a measured display to continue his fine run; it's difficult to see him losing out before the quarter finals now, but this could very well be his swansong, and his last chance to produce something of note on the circuit.

In an otherwise excellent day for seeds in the men's draw, with only last year's semi-finalist Rainer Schuttler (18) joining the Argentine Del Potro in going out, some much more assured performances were displayed on the lawns.

Roger Federer was imperious in dispatching Guillermo Garcia-Lopez in straight sets, as was Andy Murray, crushing the dangerous Ernests Gulbis was unexpected ease.

Fourth seed Novak Djokovic also enjoyed a comfortable victory over Simon Greul.

They go on to play Philipp Kohlschreiber (27), Victor Troiki (30) and Mardy Fish (28) respectively, with the prospect of some dropped sets. Of the three, Djokovic looks the most vulnerable against the American who has a very good grass court game, and it could go to five sets.

Levine lives on

The upset of the first round, 14th seed Marat Safin's surprising loss to American qualifier Jesse Levine, proved not to be a fluke, as the worlds' 133rd player eased into round three to produce his best Grand Slam performance to date.

He is now the only qualifier left in the draw, but against Stanislas Wawrinka, ranked 19, his run is likely to come to an end.

Sixth seed Andy Roddick dropped a set before setting up a meeting with tricky Austrian and 26th seed Jurgen Meltzer, a meeting which will no doubt cause some big-hitting fireworks, and both 7th seed Fernando Verdasco and Gilles Simon, ranked 8th, came through in four sets.

Chilian Fernando Gonzalez came through a very tricky match against dark horse Leonardo Mayer, ending the Argentine's campaign. Watch out for him in the future.

Having slipped coolly under the radar, Nikolay Davydenko (12) faces his first stern test against Czech Tomas Berdych, the 20th seed who defeated veteran Paul-Henri Mathieu in round two.

This has the potential to be an epic clash, as Berdych is a very good grass player. The Russian could have his work cut out. Also watch out for Tommy Haas (24) taking on Marian Cilic (11).

Best win: A Murray (3) def. E Gulbis 6-2 7-5 6-3

Upset potential: I Karlovic (22) vs J-W Tsonga (9), T Haas (24) vs M Cilic (11)

Argentina's Gisela Dulko could be the new darling of women's tennis [AFP]

Former Champion Maria Sharapova, who was second favourite for the title at the start of the week, was arguably the biggest scalp in young Gisella Dulko's career so far.

The 24 year old Argentine started well, but lost the second set before coming back and beating the Russian on her 4th match point.

The lower half of the draw seemed to breathe a collective sigh of relief as the 24th seed dumped a forehand over the baseline. Sharapova will need to work very hard if she is to recapture any of her former glory.

However, the highest seed to fall in this years draw so far was 16th seed Zheng Jie.

China's top player looked out of sorts against former top 5 Slovakian Daniella Hantuchova, who seems to have regained some long-awaited form.

She will play Ai Sugiyama in the third round, with Serena Williams lurking in the fourth; but playing as she did against Zheng, she may be out to cause an upset.

Seeds untroubled

The top eight players in the women's draw all eased through to the third round without dropping a set in what was a dominant seeded display.

Only Dinara Safina looked vulnerable in the second set, but the stellar performer was undoubtedly Victoria Azarenka, who failed to lose a single game in a double-bagel demolition of Ioana Raluca Olaru.

She goes on to face another Romanian, 30th seed Sorana Cirstea. The Williams sisters looked in very good form, but Venus will be out for revenge against Carla Suarez-Navarro, who beat her in this year's Australian Open. No doubt her dominant play will blow the Spaniard off the court.

It was a bad day for the Russian's though, as the other two seeds failing to progress were Alisa Kleybanova (27) and Anastasia Pavlyuchenkova (31).

Both were simply outplayed and out-powered, but their losses are not likely to send shockwaves around the courts of Wimbledon. Unlike the recent surge in talented Russians, these girls don't seem to have the consistency or weapons to really trouble the top 10 consistently.

10th seed Nadia Petrova had a surprisingly easy time of beating Israeli Shahar Peer, a potential banana skin, and Caroline Wozniacki produced some stunning tennis in the first set, before showing her fighting class in beating Russian Maria Kirilenko in straight sets.

Virginie Razzano, the 26th seed in these Championships, will provide a stern challenge to 7th seeded Vera Zvonereva and should cause an upset. Also sneaking through the draw is former winner Amelie Mauresmo.

Seeded 17, she could meet top seed Safina in round four if she beats 15th seed Flavia Pannetta; this has the potential to be a top match-up in the third round.

Best win: V Azarenka (8) def. I Raluca Olaru 6-0 6-0

Upset potential: V Zvonereva (7) vs V Razzano (26), G Dulko vs N Petrova (10)