Andy Murray exited Wimbledon berating his own "horrible tennis", irked by an overrule and firing out his now customary expletive.

Murray had no explanation for a strangely subdued and error-strewn performance as he fell 6-4 6-4 7-6 to Cypriot world number 16 Marcos Baghdatis in their Centre Court fourth-round clash.

Next up for Baghdatis is sixth seed Lleyton Hewitt, who came through a heated battle against Spaniard David Ferrer, 6-4 6-4 4-6 7-5.

Hewitt used his famous aggression to move two sets up and despite a slip-up in the third, Ferrer could not prevent the former champion from booking his place in the quarter-finals.

"With two sets under my belt I was happy, but I knew by no means the match was over," Hewitt said. "He runs a lot of balls down.

"He adjusted his game extremely well to grass and made me play well to beat him.

"It's always nice to get into the last eight. Sometimes you don't have to play your best tennis to get there, you just have to find a way to win.

"I've got to get better if I'm going to go further in the tournament but I'm still here."

The Roger Federer steamroller crushed another bewildered opponent at Wimbledon on Monday.

Federer was in dominant form, particularly on his own serve, as he cantered to a 6-3 6-3 6-4 victory over 13th seed Tomas Berdych.

The clock on the Centre Court scoreboard showed just one hour and 23 minutes had elapsed when Federer served out to clinch his place in the quarter-finals.

Second seed Rafael Nadal moved a step closer to becoming the first man since Bjorn Borg to add the Wimbledon crown to his French Open title in the same year with a straight-sets win over qualifier Irakli Labadze.

The 20-year-old second seed continued his fine transition from clay to grass against the Georgian, and eventually prevailed 6-3 7-6 (7-4) 6-3.

Nadal will next meet Finland's Jarkko Nieminen, who secured his place in the quarter-finals after a tight 7-5 6-4 6-7 6-7 9-7 victory over Russian Dmitry Tursunov.

Mario Ancic overcame the warm weather and a valiant display from Novak Djokovic to take his place in the quarter-finals following a five-set epic.

The seventh-seeded Croatian was forced to battle back from 2-1 down against the 19-year-old before eventually sealing a 6-4 4-6 4-6 7-5 6-3 victory to set up a last-eight clash against defending champion Roger Federer.

Meanwhile Radek Stepanek and Jonas Bjorkman will meet in the last eight.

Stepanek, the 14th seed, saw off Fernando Verdasco in five sets, figthing back from two sets to one down to record a 6-7 (4-7) 6-3 4-6 6-4 6-2 victory.

Swedish veteran Bjorkman, the former world number four, also went the distance, but staved off Max Mirnyi's impressive fightback, winning 6-3 7-6 (8-6) 4-6 2-6 6-3.

In the ladies' singles, former champion Maria Sharapova was made to fight all the way before booking her place in the quarter-finals.

Italian Flavia Pennetta, the 16th seed, provided a stern test, but Sharapova eventually passed it, winning 7-6 (7-5) 3-6 6-3.

However, she will not have been pleased with her error-strewn display out on Court Two.

She will next meet fellow Russian Elena Dementieva.

Sharapova said: "I will have to step it up for my next match. You can't come out every day and play your best but I have to try.

"Hopefully I will improve tomorrow. It is going to be really tough because it always is against her. She's physically very strong and gets a lot of balls back.

"I have to be ready for another big fight."

Dementieva, the seventh seed, earlier raced through to the last eight with a 6-2 6-0 victory over Shenay Perry, the match lasting just 54 minutes.

Perry's defeat means the United States will not have a player in the quarter-finals for the first time since 1911.

Anastasia Myskina made it three Russians in the last eight with her victory over Jelena Jankovic.

Jankovic was unable to follow up her victory over Venus Williams and went down 6-4 7-6 (7-5).

She will now face top seed Amelie Mauresmo who downed Ana Ivanovic 6-3 6-4.

Both players were below par, but it was Mauresmo who made the least errors and she duly wrapped up a straight-sets win.

Justine Henin-Hardenne also progressed to the quarter-finals with a crushing victory over Daniela Hantuchova.

The French Open champion, looking to complete a rare Grand Slam double, won 6-3 6-1 on Centre Court.

She has yet to drop a set, but Henin-Hardenne was keen to play down expectations afterwards.

"Everyone is talking to me about that (winning), but I don't want to look too far," she said.

"It's not easy. A Grand Slam, it's seven matches. I'm still very, very far from that. Let's go slowly."

Next up for the Belgian will be Frenchwoman Severine Bremond after she defeated Martina Hingis' conqueror Ai Sugiyama 7-6 (13-11) 6-3.

Henin-Hardenne's compatriot Kim Clijsters also lost only four games as she put out Agnieszka Radwanska, the reigning junior champion in SW19.

Clijsters won 6-2 6-2 and she will now face China's Na Li who upset 10th seed Nicole Vaidisova 4-6 6-1 6-3.