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Stanislas Wawrinka overcame injury and a partisan New York crowd to reach his first ever grand slam quarter-final with an epic five-set victory over Sam Querrey at Flushing Meadows.
The Swiss number two, a winner over Britain's Andy Murray in the previous round, dug deep before grinding out a memorable 7-6 6-7 7-5 4-6 6-4 triumph on Arthur Ashe Stadium.
His reward is a last eight date with Russian Mikhail Youzhny - a four-set winner over Tommy Robredo earlier on Tuesday afternoon.
Quite what state Wawrinka will be in for that match remains to be seen after he recieved yet more treatment on his already heavily bandaged thigh during his four-and-a-half-hour triumph over Querrey.
The number 25 seed edged an even first set 11-9 in the first of two tie-breaks, Querrey levelling matters in the sudden-death situation next time around.
Wawrinka then came from 3-1 down to win the third set, but Querrey broke once to level again and send a gripping fourth round clash into a decider.
Both players scrapped for every point but it was Wawrinka who snatched the decisive break in the 10th game to stun the home crowd and shatter Querrey's dreams.
The win sees Wawrinka join countryman Roger Federer in the last eight - the first time in the Open era two Swiss players have reached this stage of a major.
Youzhny booked his place in the last eight with a more straightforward 7-5 6-2 4-6 6-4 victory over Robredo.
The Russian, who reached the semi-finals at Flushing Meadows four years ago, overcame a sluggish start and a small mid-match slump to prevail in impressive style.
Robredo squandered two break points in the fourth game of the contest and was made to pay for his wasteful play when Youzhny picked up a break in the 11th game.
The 12th seed then served out the set to secure the advantage before coming back from 0-30 down to win his next service game at the start of the second set.
And Robredo then dropped his serve again in the next game as Youzhny angled a fine backhand beyond him.
Another break of the Robredo serve quickly followed as Youzhny put the second set beyond doubt, leaving his Spanish opponent to smash his racquet into the ground in frustration.
Robredo managed to regain his composure in the third set and raised hopes of a comeback when he broke in the 10th game to halve the deficit.
But Youzhny struck back in the fourth set, breaking in the fifth game with the aid of a favourable net cord and going on to close out the win.
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