Andy Murray
Murray inspired GB to the last eight with two singles victories.Getty Images

Andy Murray overcame John Isner in straight sets to send Great Britain through to the Davis Cup quarter-finals at the expense of the United States with a match to spare in Glasgow.

Murray maintained his 100% record over Isner with a 7-6 6-3 7-6 win over the world number 20 to send GB through to the last eight for a second straight year where they face against France at home on 17-19 July.

The British number one's victory over Donald Young on day one followed by James Ward's five set victory over Isner set up the win for Leon Smith's side, despite Bob and Mike Bryan winning the doubles rubber over Jamie Murray and Dominic Inglot.

Though the Bryan Brothers had given US a lifeline in the tie with their dramatic five-set win over Jamie Murray and Dominic Inglot in the doubles rubber, Murray knew victory over a jaded Isner would put Britain through to another quarter-final.

But in the early sages of the opening set Isner looked the fresher, with his booming serve backed up by some striking forehand blows, which forced Murray to save four break points across the fourth and eighth games of the opening set.

Murray then faced three set points in his next service game as his game fell apart on his home turf but two wild forehands from Isner and a timely ace saw the two-time grand slam champion wriggle away and eventually secure a tiebreak.

A double-fault from the American allowed Murray to take a 3-0 lead and the Scot from that point forward unstoppable, taking the first set from under the nose of Isner after over an hour played.

It was a psychological blow which would help Murray towards a comfortable victory, taking the second set via a single break after magical chip over Isner who was beginning to show signs of the physical nature of his 4 hour 58 minute defeat to James Ward.

Isner showed shoots of recovery in saving three break points in the first game of the third set and the American's thunderous serve meant he remained a menace as Murray looked to make quick work of his under-fire opponent.

The final set in the end went to an inevitable tiebreak where after being presented with four match points, Murray took the third of them on his own serve with an ace to claim GB's first home world group victory for three decades.