Andy Murray sealed his Davis Cup quarter-final place with a straight-sets win over American John Isner in Glasgow.
The Scot sealed the set for Great Britain with a 7-6 (7-4) 6-3 7-6 (7-4) win, giving GB a 3-1 lead in the World Group first-round tie.
Britain will next play France at home in July, with the venue to be decided.
“It feels great. This is a team effort and I think everyone agrees the team played their part,” said Murray.
Murray, who returned to play in Scotland this week for the first time in four years, looked edgy in the early stages against Isner but was clinical when it counted.
“On behalf of all of the players I want to thank the crowd because it’s been one of the most special atmospheres I’ve ever played in,” he added.
Murray had been a heavy favourite to finish the job for Britain against a player who had suffered a “brutal” five-set defeat by James Ward on Friday.
It is the second year running that Britain have beaten the United States, and Isner said: “This one’s on me.
“My team-mates may say otherwise but when you look at this match-up on paper, my loss on Friday put us in a huge hole.
“It’s so, so disappointing for me. I feel like I let us down this week. It’s a terrible feeling.”