ANDY MURRAY was today warned to get his first serve right if he wants to beat former world No.1 Juan Carlos Ferrero and book a Wimbledon semi-final spot.

By Stewart Fisher

ANDY MURRAY was today warned to get his first serve right if he wants to beat former world No.1 Juan Carlos Ferrero and book a Wimbledon semi-final spot.

Scottish star Murray takes on 2003 French Open champion Ferrero of Spain in the quarter-finals on Centre Court.

The 22-year-old will once again have massive backing from over 15,000 fans inside the famous arena as well as an enormous armchair contingent watching at home on television.

Close to 12 million viewers watched his nail-biting five set victory over Stanislas Wawrinka in his last-16 tie on Monday night.

However, former British No.1 Tim Henman, who played in five Wimbledon semi-finals in his career, reckons Murray has to raise his game a level to progress.

Henman explained: "Murray played Ferrero at Queen's Club and was a class apart. Having said that, Murray did get parts of the match with Wawrinka tactically wrong.

"Wawrinka made the adjustment to playing under the roof a little bit quicker than Murray. Closing the roof doesn't do anything to the grass surface itself, but it really affected the movement of the ball through the air.

"When the humidity is high, the air is a bit thicker and the ball doesn't go through it so quickly.

"You can really go after your shots and you never have the feeling that ball is going to fly long. Wawrinka really did a good job because he served aggressively and hit the ball so hard.

"Murray struggled to make this adjustment on his serve. I'm sure he has been working on his serve a little bit and going through a few routines, but he only needs minor adjustments.

"Murray plays his best when he is a little bit more pro-active. He has got the ability and the technique to really take the ball on."

Meanwhile, legendary tennis coach Nick Bollettieri believes Murray's beefed-up physique will help him clinch a place in the last four.

The man who coached Andre Agassi and the Williams sisters to Wimbledon glory said: "His physical fitness will sustain him like it did 48 hours ago.

"Without the muscle, stamina and power he had, he would have been a goner on Monday."