Such talent, such strength and such a fantastic chance at Wimbledon - yet still Andy Murray has his detractors. Maybe it's because the Scottish tennis star revealed he was supporting "anyone but England" in the 2006 World Cup.

"I made a joke about the England team, like I do with my friends," he explains in an exclusive interview for the new issue of Radio Times. "And they joke about Scottish football all the time! That's when I realised I couldn't afford to make jokes like that."

If he's decided to avoid that, he's also trying to shed his famous grumpiness and says he's not the first to go through this. "Growing up, Andre Agassi was my favourite player to watch. He's one of the few people who have been bigger than tennis. He went from being disliked - he used to get angry on court and throw tantrums - and then he changed. By the end of his career he was loved."

Now that he's used to being a focus of attention, he says things are going better. "I struggled. [But] the past year and a half has been much easier because I've a lot more experience and I'm a lot more mature."

With growing media experience comes growing professionalism in all areas: "I hired two fitness trainers at the end of 2007. It was probably the best decision I've made."

His new attitude and his intense physical training regime have already led him to victory at Queen's this week, where he was the first Brit to win since 1938.

But he's wary of being too cocky about his chances for Wimbledon glory: "It's possible. You need a little bit of luck - you've got to win seven matches. And I've got two of probably the best players of all time in the draw: [Roger] Federer has won five Wimbledons. Rafa [Nadal] has been in the past three finals and won six grand slams. So if I can do it, it would be an unbelievable achievement. But this year? I've got to play my best to do it."