Andy Murray prepares for Andy Roddick clash

A leg-weary Andy Murray will face Andy Roddick in the Cincinnati Masters quarter-finals at 0100 BST on Saturday.

US former world number one Roddick is the ninth seed in Ohio, but has lost twice to the young Scot this season.

The British number one has another weapon in his corner in the guise of Roddick's former coach Brad Gilbert.

Gilbert will have plenty of know-how on his weaknesses and areas for Murray to exploit having coached the American to US Open glory in 2003.

Roddick's form since severing ties with Gilbert has gone off the boil, while Murray's has been continued its upward trend since he linked up with the former mentor of Andre Agassi at the end of last month.

Murray heads into the clash against Roddick in the form of his life having barely had a day away from the courts in the last three weeks.

But after reaching the final of the Washington Masters two weeks ago, and the semis in Toronto last week, a determined Murray has not let fatigue take over.

Instead, he ended Roger Federer's 55-match winning streak in North America in straight sets earlier this week.

He also came back from a break down in the third set against Robby Ginepri to book his place in the last eight Cincinnati.

Murray, however, may not need a detailed account on how to get the better of Roddick as he holds a 100% record against him with two wins from two.

A straight sets triumph in the third round of Wimbledon, a victory which Murray exclaimed was "the best of his career", came after the Scot had beaten the American on his way to claiming his maiden ATP title in San Jose earlier in the year.

Roddick feels he is the underdog as he gears up to face the teenager again.

He said: "He's been on a bit of a hot streak, so unlike the two times before we've played, people probably might give him the edge right now."