MELBOURNE: Andy Roddick staged one of his great recoveries to come from behind and claim a five-set victory over Chile's Fernando Gonzalez and reach the Australian Open quarter-finals early Monday.

The American seventh seed looked in trouble when he fell behind two sets to one but clawed back for a 6-3, 3-6, 4-6, 7-5, 6-2 win over the 11th seeded Gonzalez, a former finalist here, in three hours 25 minutes.

Roddick will now play Croatian 14th seed Marin Cilic, who earlier knocked US Open champion Juan Martin del Potro out of the tournament in five sets.

"I was lucky to get out of that one," Roddick said. "I was behind for much of the four sets and I was trying to stick at it to give myself a shot.

"When Fernando gets hot you know that a lot of the match is out of your control. I was playing really good tennis in the second and third sets, but what helped me was being able to serve through."

Roddick is a four-time semi-finalist in Melbourne and is looking for his second Grand Slam title to add to his 2003 US Open win.

He stretched his winning streak to 9-0 this season after his victory in the lead-up Brisbane International tournament.

It was Roddick's ninth victory over Gonzalez in their 12 meetings and he has now won seven of their last eight match-ups.

Roddick now remains the only American left in the men's singles after the elimination earlier in the day of John Isner by Andy Murray.

Roddick got quickly out of the blocks and claimed the opening set in 29 minutes after breaking the Chilean in the sixth game.

But Gonzalez hit his straps and began to get his potent forehand more into play to put Roddick under pressure.

He broke Roddick in the sixth game and levelled the match.

Gonzalez was under early pressure in the third set, surviving break point in his opening service game before breaking Roddick's serve in the ninth when the American smashed out.

Gonzalez survived four set points in the 10th game of the fourth set but could not withstand the fifth set point in his next service game when the Hawk Eye video review ruled in Roddick's favour to level the set scores.

Roddick got a service break in the second game of the fifth set, which prompted the Chilean to smash his racquet into the court and get a code warning from the umpire.

It was plain sailing from there for Roddick who quickly wrapped up the match on his third match point when Gonzalez double-faulted.