Andy Murray admitted that he will need to up his game if he is to have any chance of beating Stanislas Wawrinka to reach the US Open semi-finals.
Murray, defending his US Open title for the first time, struggled to find his rhythm in his fourth-round win over Denis Istomin Tuesday.
The Scot dropped the first set at Flushing Meadows but then showed his strength to come back and win the next three sets.
The World No.65 certainly made Murray work hard and upcoming opponent Wawrinka showed he was on form in overcoming fifth seed Tomas Berdych.
Wawrinka is now back inside the top ten in the world rankings for the first time since 2008 and Murray is expecting a tough match as he looks for improvement in his own game.
“Hopefully I’ll start playing a little bit better from now on,” he said. “Sometimes the first week of a slam, I’ve played very well. Sometimes you maybe feel like there’s something to lose a little bit.
“But I’m in the quarter-finals of a slam. It’s not an easy thing to do, and the matches are going to get tougher. I’ll have to up my game. I’ll need to play a good match.
“He’s improved quite a bit this year. Some of the things he didn’t do so well before he’s improved.
“He has a very good backhand. He serves well. He’s solid up at the net. He makes a lot of returns. He makes it very tricky for you. He’s a top player. It will be a very tough match for me.”
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