Andy aims to trust in his instinct.

ANDY Murray insists he will not change his approach at this week's Barclays ATP World Tour Finals in London even if it jeopardises his chances of winning the prestigious title on home soil.

The British No 1 qualified for the eight-man end-ofseason tournament for the first time last season and won all his three round-robin matches.

However, he had already qualified for the semi-finals before he faced Roger Federer and he said the effort he put in to beat the 15-time grand slam champion meant he was not at his best in his last-four defeat by Nikolay Davydenko.

Murray left little doubt about his intentions, though, when he declared: "I'd do the same thing again.

"I thought it was a good decision. A lot of people say, 'you focus too much on results and winning all the time', but obviously winning against Federer is one of the best wins of the year for me and one of the biggest competitions.

Epic "Unfortunately it didn't go well for me the next day but winning against Federer six times and losing three times, I can keep that with me for my career.

"It's not always just about winning tournaments all the time, sometimes it's nice to beat the big players in epic matches and unfortunately sometimes that takes it out of you a little bit."

Murray is set to play Federer on Tuesday or Thursday but first up for the 22-yearold is Juan Martin del Potro in the opening singles match in Group A at the O2 Arena this afternoon, with Federer facing Fernando Verdasco in the late match.

The big-hitting Argentinian twice came from a set down to defeat Federer in the final of the US Open.

Murray, though, was not surprised to see the 21-yearold break his grand slam duck. "He's been in the top five in the world for about a year and a half so it's not like he came out of nowhere," said the world No 4. "He'd been having a very good year; he very nearly beat Federer in the semis at the French Open, made the quarters at the Australian and he's won quite a few tournaments."

Del Potro, since that spectacular New York triumph, has only two victories to his name.

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EFFORT: Andy Murray