Andy Murray is to make his debut in the music charts after becoming an unlikely rapper on a new record.

The Dunblane-born tennis star has recorded a segment for Autograph by Bob and Mike Bryan, the American Grand Slam-winning doubles players, which is just out on iTunes.

However, the 22-year-old’s vocal efforts got a cool reception from people in the music industry, who rate the song’s chances of becoming a hit as high as the odds of US rapper Jay-Z winning Wimbledon.

The music-loving Bryan brothers convinced Murray and Novak Djokovic to lend their “talents” to the song during this year’s US Open.

The track is about the attention famous sportsmen receive from autograph hunters.

Murray, in his distinctive Scottish monotone voice, raps the lines: “During Wimbledon it really gets crazy. My hand cramps up and my mind gets hazy. I sign and sign but the line doesn’t end. Wake me up tomorrow and let’s do it again. Autograph.”

Ronnie Gurr, the Edinburgh-based music industry manager who has worked with Stereophonics and Culture Club, said: “Murray spectacularly fails to grasp the concept that rapping must have a rhythmic dynamic. What this amounts to is nothing more than reading aloud a bad lyric about the plight of celebrities being asked to sign their names for adoring fans. Never has the maxim, never give up your day job, been more apt.”

Despite his musical faux pas, Murray has revealed that he has learned to avoid gaffes with the media by becoming as boring as his friend Tim Henman, who he said had avoided bad publicity by being dull.

“Throughout Tim’s career people said he was boring but he was being sensible,” said Murray. “I had to absorb the lesson that talking to guys from the media wasn’t like talking to my friends, that there could be problems with speaking too freely, without holding anything back. It’s so much less hassle to answer things in a straightforward way.”

In the updated version of his autobiography, published earlier this month, Murray said that he had learnt to become media-savvy.

“I’m much more composed now about my media responsibilities,” he explains. “If I feel people are being rude to me I won’t talk to them but in the day-to-day operation of player-media relations I’m willing to take part. But I’m careful, like Tim, so don’t expect me to be controversial.”

Murray attracted notoriety early in his career for a number of unguarded comments.

In 2006, he was booed by spectators at the Heineken Open in Auckland after saying he and his opponent had “played like women” following a poor performance.

Later that year he became a hate figure among some English supporters during the World Cup when he said would be supporting “whoever England are playing against” after being teased about Scotland’s absence from the tournament.

In 2007 he again landed himself in hot water when he told a BBC reporter investigating match-fixing in tennis that “everyone knows it goes on”.

Murray later said that he had been quoted out of context and that he was referring to the fact that it was well known that players were offered money to throw matches. The dispute led to him briefly refusing to do any interviews with the BBC.

Despite reaching four Wimbledon semi-finals, Henman attracted criticism for his lack of charisma. Critics said the former British No 1 showed little emotion on or off court and he was often described as the most boring man in the game.

“I was smart enough to know that there was a right answer and there was an honest answer, and I was probably guilty, if that’s the right word, of giving the right answer,” he said in a recent interview.

“That was my defence mechanism. That was me trying to deflect attention. Then you are called a boring t***, but it was never a popularity contest.”

Murray recently engaged the services of 19 Management, whose clients also include David and Victoria Beckham. Before he signed up, Murray told Simon Fuller, the head of the company, that he was not interested in celebrity but wanted to be appreciated as a tennis player.

He is competing in the ATP World Tour Finals at London’s 02 Arena this week. Murray plays his opening match today against the US Open champion Juan Martin del Potro in the end-of-season tournament involving the world’s top-eight players.

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