The world No 2 had been superb in his first three matches but had to show his fighting qualities on Monday, particularly in the second set.
Wimbledon: Andy Murray wobbles but topples Mikhail Youzhny
Andy Murray survived a case of the Wimbledon wobbles to defeat Mikhail Youzhny in straight sets and reach the quarter-finals for a sixth successive year.
The world No 2 had been superb in his first three matches but had to show his fighting qualities on Monday, particularly in the second set as he recovered from five games to two down and then 5-3 adrift in the 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, 6-1 to make the last eight, where he will meet Spain's Fernando Verdasco.
Murray told the BBC: "I don't expect to come into these sort of events to win them, there's no guarantees.
"I've only won one. I'll just keep trying hard to keep winning. It gets harder as the tournament goes on.
"Serena Williams lost today, she doesn't lose particularly often. Roger [Federer] lost and Rafa [Nadal] lost. All these guys and girls are better players than me and have achieved a lot more than me so if they can lose, so can I."
The Scot was happy with the way he came through in the end on Centre Court, saying: "It was a tough match, the first couple of sets especially.
"He also had a couple of chances at the start of the third set as well but once I got ahead in the third I concentrated very hard not to let him back in like I did in the second set.
"I just managed to turn the second set around in the breaker at the right moment. I came up with some good shots from 5-2 down."
Meanwhile, live wire Jerzy Janowicz roared into the last eight on a momentous day for Poland.
The 22-year-old Lodz native with a seeding to match his years came through a ferocious duel with Austrian Jurgen Melzer, winning 3-6, 7-6, 6-4, 4-6, 6-4 to set up a last-eight clash with 130th-ranked compatriot Lukasz Kubot, who clinched a 4-6, 6-3, 3-6, 6-3, 6-4 victory over fellow outsider Adrian Mannarino of France..
Not since Wojtek Fibak reached three consecutive grand slam quarter-finals in 1980 has a Polish man survived until the quarter-finals and two achieved the feat in a matter of minutes.
"It's unbelievable what is going on right now," the 6ft 8ins Janowicz, who rose 200 places up the rankings last year, told reporters, just as a scoreboard flashed up women's fourth seed Agnieszka Radwanska completing a great day for the Poles.
"We have this moment two players in quarter-final in men's draw. This is by far the best thing to happen to Polish tennis."
"I went straightaway to [Lukasz's] locker room. We hugged."
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