Andy Murray has sealed a 3-1 Davis Cup win for Great Britain with a straight-sets victory over American No.1 John Isner.

Murray, the world No.5, 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 on Sunday.

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 No.1 doubles team got the job done, but not without a scare as Murray, the brother of Davis Cup teammate Andy Murray, and Inglot recovered from two sets down.