Gilbert still believes in Murray

In a lucrative deal funded by the Lawn Tennis Association, Gilbert coached Murray from July 2006 to November 2007, the Scot rising from 36th in the world to a high of eighth before Murray then decided to go his own way and hire a coaching team.

And the American, who also coached Andre Agassi and Andy Roddick has no doubts his former pupil is capable of achieving something neither Tim Henman nor Greg Rusedski ever managed, saying: "There's no question. I don't think I ever would've started with Andy if I didn't feel like he could win. I know deep down he thinks he can win."

He added: "He thought before I started coaching him that hardcourt was his best opportunity. I told him, 'I think grass is your best opportunity', because so few guys play well on it.

"I think the thing Andy does so well is mix up his speed, he anticipates. You don't think he's that fast but he's always there and he's got great hands. His movement is outstanding.

"I think that his game is positioned well to play great on grass."

Murray faces Gasquet in the fourth round on Monday aiming to reach the first grand slam quarter-final of his career.

Eighth seed Gasquet, a semi-finalist here last year, has won both of their previous meetings while Murray has lost his last five matches against seeded players at grand slams, but Gilbert feels a change in attitude is helping the 21-year-old bring out his best tennis on court.

"The biggest thing is he's being more positive on the court. He's not moping, he doesn't have his head down, you're seeing a lot more fist pumps," Gilbert added on BBC2. "There are times that you would think in the past he would get crazy.

"He's keeping it together, he's not yelling over at his box. He's keeping it between the lines."