Ivo Karlovic is hoping his greatest weapon will continue to serve him well after claiming his place in the last eight at Wimbledon.

The Croatian has troubled all of his opponents so far with his huge serve, and Fernando Verdasco barely got a look-in during their fourth-round clash yesterday.

The 22nd seed will now take on Roger Federer for a place in the semi-finals and Karlovic is aware he will need to produce a performance similar to that which saw him past Spaniard Verdasco 7-6 (7/5) 6-7 (4/7) 6-3 7-6 (11/9) on Court One.

The men's quarter-finals will be played tomorrow.

"Against Verdasco I was feeling good on my serve," said Karlovic, who served 35 aces. "It's unbelievable he did not (create) one break point.

"The only thing that I was a little bit unlucky, in the last tie-breaker, he returned a few unbelievable shots, but other than that I was feeling good on my serve.

"Of course I'm really happy because I'm in the quarter-final."

Five-time champion Federer saw off Robin Soderling in straight sets to set up the meeting with Karlovic.

The Swiss world number two has had to deal with much of the attention in the absence of last year's champion Rafael Nadal, and is favourite to claim another All England Club title although he refuses to look beyond the next round.

"The important thing is that I keep on moving in the draw, that I'm playing well," said Federer.

"I thought I played a great first week. Against Soderling it was different just because there's not that many rallies. It was a different type of match.

"It could be the same again next round, so I'm excited I'm through to another quarter."

Novak Djokovic will also have one eye on Federer's half of the draw as he continues to make his almost unnoticed passage through the rounds.

The Serbian fourth seed easily beat Israel's Dudi Sela 6-2 6-4 6-1 yesterday on Court Three, and seemed happy to be away from the attention which comes with playing on Centre.

"There were so many important encounters (on Monday)," Djokovic said. "So many good players, interesting matches.

"You had to put all these players on the show courts so I won't criticise the organisers.

"I've played on that court before. It's normal you have to adjust all the time. You can't play on Centre Court all the time."

Djokovic's next test will come against veteran German Tommy Haas, who beat the Serbian in the final at Halle recently, while Lleyton Hewitt will face a familiar foe in Andy Roddick.

Hewitt had to overcame injury and a two-set deficit to beat Radek Stepanek, but Roddick had a much easier route through in three sets against Tomas Berdych.

Australian Hewitt is looking forward to renewing his rivalry with the sixth seed.

"We both know each other's game pretty well," said the 2002 Wimbledon champion. "We played at Queen's only a couple of weeks ago.

"You know you're going to get aced out there and he's going to come up with some big shots."