Andy Murray survived a few wobbles to defeat Mikhail Youzhny in straight sets and reach the Wimbledon quarter-finals for the sixth successive year.

The world number two had been superb in his first three matches but had to show his fighting qualities today, particularly in the second set as he recovered from five games to two down and then from 5-3 behind in a tie-break.

Youzhny was a quarter-finalist here last year and is a talented grass-court player, but the third set was largely one-way traffic as Murray came through 6-4 7-6 (7/5) 6-1 to make the last eight, where he will meet Spain's Fernando Verdasco. 

Elsewhere, fourth seed David Ferrer continued his battling run through the Wimbledon draw with a four-set win over Croatia's Ivan Dodig to reach the last-eight.

The Spaniard, who has been troubled by an ankle problem, needed five sets to see off Alexandr Dolgopolov in the third round and dropped the opener on a tie-break today.

But he came out on top in a second-set tie-break and that proved to be the key moment in the Court Two encounter as Ferrer ran away with the match to win 6-7 (3/7) 7-6 (8/6) 6-1 6-1.

Ferrer's best run at Wimbledon came last year, when he made it to the quarter-finals, and in the last eight this time he was awaiting the winner between Argentinian eighth seed Juan Martin del Potro and Italy's Andreas Seppi.

Former Wimbledon finalist Tomas Berdych set up a quarter-final against top seed Novak Djokovic after ending unseeded Bernard Tomic's run with a 7-6(4) 6-7(5) 6-4 6-4 fourth-round victory on Monday.

A tight encounter was dominated by serve for the first two sets before seventh seed Berdych asserted his authority.

"Tough to play him so it makes me feel even better to be here as a winner," the Czech said after mastering the 20-year-old Australian, who had beaten seeds Sam Querrey and Richard Gasquet on the way to the last 16.

"I was kind of struggling with his fast routine on serve, I couldn't get a return on it at all. But after the first two sets I felt much more confident."

Berdych upset Djokovic in the semi-finals three years ago before losing to Rafa Nadal in straight sets in the final. That victory was just one of two he has enjoyed over the Serb, including the last time they met - in Rome on clay in May.

The Serb has triumphed in their 13 other meetings.

"It's a nice challenge," Berdych added. "I know how to beat him, let's try for the same."