Finally, Federer made the decisive breakthrough in a superb 10th game, firing a beautiful backhand winner and a crunching cross-court forehand before Murray dumped a drop shot in the net at set point.

It did not appear to boost the champion's confidence though and he played a poor game to drop serve at the start of the second.

He handed Murray the break with two wayward forehands and soon slipped 5-2 down after a disastrous seventh game, with two double-faults and two dreadful volleys giving Murray the double-break.

Andy Murray of Great Britain jubilates after scoring against Roger Federer of Switzerland during the men's singles competition at Tennis Masters Cup Shanghai, 2008, in Shanghai, east China, Nov. 14, 2008.

Remarkably, it was the Briton who then suffered a shocking slump in form and he became increasingly angry as Federer wiped out the advantage, Murray double-faulting to bring the score level at 5-5. Federer appeared in trouble when he slipped a mini-break down early in the tie-break and, despite winning the point of the match with a backhand smash, it was Murray who was in control throughout.

As the final set got under way, Federer twice had lengthy treatment from the trainer on his lower back - an area he had suffered problems with in the build-up to the tournament.

Murray duly broke serve early in the decider and Federer, moving gingerly between points, looked on the verge of spoiling his record of never having quit during a match.

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