ANDY MURRAY hopes to make it a magnificent seven when he takes on Feliciano Lopez in the third round here tomorrow.

The Scot has won all six of his previous encounters against the world No.31, including here and at Wimbledon last year. Murray will leave nothing to chance as he chases a maiden Grand Slam win.

Unusually for a Spaniard, Lopez – referred to as Deliciano by Murray's mum Judy, likes to use serve-and-volley tactics, and that game should play to the Scot's strengths.

"Lopez I've played a lot," Murray said. "He's got a big serve and likes to come to the net. But I've always played well against him. I played him here last year in a night match and I have had good success against him. But because of his style, he can make it very tricky."

Although Murray stole a march on the remainder of the men's draw and guaranteed himself a couple of days off when he came through in just under two hours against Croatia's Ivan Dodig in the early hours of yesterday, the match is likely to take place in temperatures in the mid-80s which have been forecast for New York during the Labour Day public holiday weekend.

Murray, who suffered cramps during his first-round match against Alex Bogomolov Jr, is determined to learn the lessons from his first-round tie and play it cool tomorrow.

"There's a few things I'll do differently going into the match," said the 25-year-old from Dunblane, who saw his section of the draw open up when his potential quarter-final opponent Jo-Wilfried Tsonga crash out to Martin Klizan of Slovakia.

"Possibly against Lopez it would be a different match. Points should be a lot shorter. And if I serve like I did against Dodig, I'll be able to dictate a lot more of the points and won't have to do as much running."

Murray doesn't feel he has received any special treatment as Olympic champion in New York this year.

But being the first man through to the third round makes a difference from last year, where by this point he had only just completed his first-round match. "I don't think it has ever happened," the Scot said. "I have never played my matches here Monday, Wednesday.

"The first year I played I didn't and the last few years it has not been like that. It's nice to be in that position because I have had some tough schedules here. I was happy to play on Monday and it has worked out."

So unhappy was the Scot with his schedule 12 months ago, that he formed part of a delegation with Rafael Nadal to the United States Tennis Association (USTA) in an attempt to sort out matters including a better procedure for informing players about rain delays.

The World No 4 hopes the USTA have learned their lesson and feels the signs are good.

"The players were disappointed [last year]," Murray said. "It was raining and we were hanging around all day. Then when we were going on the court, it was still wet and whatnot.

"All we want to be kept informed. It can be hard when you have to wait around for six hours not knowing when you're on."

Andy Roddick has announced that he will retire from tennis after the tournament. The 2003 champion chose his 30th birthday to make the announcement, meaning his second-round clash with Australia's Bernard Tomic today could be his last match.