Pat Cash believes British hope Andy Murray has to be at his absolute peak if he is overcome the world's top three at Wimbledon.
Murray is seeded fourth for the famous competition at the All England Club, with Rafael Nadal, Roger Federer and Novak Djokovic his likely obstacles to a maiden Grand Slam victory.
Australian Cash, who claimed his lone major at Wimbledon in 1987, believes the 24-year-old Scot has what it takes to oust the favourites, but only if he produces his very best form.
"I think Andy can make a mess of a lot of players but when it comes to the top four, he's really got to play his best," Cash said.
"He's really got to go for his shots."
"He's got a great variety and all that sort of stuff but we've just seen that in the big Grand Slams, over five sets, it just falls short a little bit."
"So he's probably going to have to pump it up a little."
"But I think he's capable of doing that - we saw him do that at Queen's so hopefully we'll see a bit more of an aggressive Murray, who will continue to stay focused for the whole tournament."
While Murray is a genuine candidate to end Britain's long wait for a men's Grand Slam singles title, Cash's native Australia - once a dominant force on the tennis scene - are now looking at the prospect of a long barren spell.
"Australian tennis is on a downer," Cash said.
"It's been going down for quite a few years. Lleyton (Hewitt) has been holding the flag."
"We have a lot of talented kids playing sport but they are not picking up tennis rackets so we haven't marketed tennis very well."
"It's started to be marketed but it is a long way behind other sports."
"I think it is going to be a few years. We've got some young players coming through but whether they are superstars or not is another story."