GLASGOW (AFP) - Andy Murray sealed a 3-1 Davis Cup win for Great Britain with a straight-sets victory over American number one John Isner on Sunday.

Murray, the world number five, saved three set points before winning the opener on a tie-break and stayed in control after that to claim a 7-6 (7/4) 6-3 7-6 (7/4) first round victory in Glasgow.

The win clinched a 3-1 triumph over the United States and set up a World Group quarter-final tie against France.

Bob and Mike Bryan had kept the United States in with a chance of a dramatic fightback as they held off a strong challenge from Jamie Murray and Dom Inglot to win 6-3, 6-2, 3-6, 6-7 (8/10), 9-7 on Saturday.

Faced with a 2-0 deficit after Friday's singles matches, the Bryan brothers knew another loss would condemn the USA to an embarrassingly quick defeat in Glasgow.

The world's number one doubles team got the job done, but not without a scare as Murray, the brother of Davis Cup team-mate Andy Murray, and Inglot recovered from two sets down.