Renowned tennis coach Nick Bollettieri has said that Briton Andy Murray needs careful management if he is to have a chance of reaching the top.
"What he needs now is a very good support team," Bollettieri told BBC Five Live's Sportsweek programme.
"This young boy needs to have someone with him to show him what to do and what not to do off the court.
"But he has only had one bit of success so far and although he could be something, he is nothing yet."
Bollettieri, who has coached the likes of Andre Agassi, Jim Courier, Maria Sharapova and Monica Seles, said he is impressed with Murray's Wimbledon display.
"He's very similar to Andy Roddick about three years ago," he said.
"It is important that his energy is channelled in the right direction but it is nice to see the spirit and confidence he has.
"He's a very confident young man who shows his emotions and there is nothing wrong with that.
"Although I am enthusiastic about him, I would sit down with him and tell him that the more he waves his hands and jumps up and down the more he will be noticed.
"If he does that, he had better be ready to produce because that will be the most difficult thing."