Andy Murray took Great Britain through to a first Davis Cup final since 1978 with victory over Australia's Bernard Tomic in Glasgow.
The British number one secured the decisive third point with a comprehensive 7-5 6-3 6-2 win.
It gave Britain an unassailable 3-1 lead in the best-of-five tie, setting up a final against Argentina or Belgium.
Britain last won the Davis Cup in 1936, with a team led by Fred Perry.
The final will be played from 27-29 November, and will be a home tie against Argentina or an away against Belgium, with the venue to be decided.
Andy Murray: "Winning for your country and your team-mates means a lot. The crowd were unbelievable from the first ball to the last. I didn't feel great the whole weekend to be honest, I've been struggling with my back, but I just tried to disguise it."
GB captain Leon Smith: "He's quite good isn't he? It's pretty amazing watching Andy's work over the whole weekend, he fights so hard and he's got the quality. He executed it perfectly today."
Late call-up Dan Evans: "I'd be at home watching if I hadn't been a part of this tie. I'll probably never get to experience something like this again, it's been so good coming in, the boys have made me feel really welcome."
James Ward, who was left out of the singles, when asked if he'll be in the team for the final: "Hopefully, I've got to go away and make myself the obvious choice. It's been a stressful few days so it'll be nice to get home and have a few days off."
It always seemed unlikely that Murray would let a chance to make history slip away after Saturday's thrilling doubles victory, and the Scot completed the job in another raucous Glasgow atmosphere.
Australia captain Wally Masur had chosen to stick with Tomic, his number one player at 23rd in the world, for the fourth match.
Murray had won both previous contests against the 22-year-old, but the Davis Cup brings its own unique pressure and he betrayed signs of nerves when failing to serve out the first set.
He made up for it with another break of serve in the 12th game, however, urged on by most of the 8,000 watching as he sealed the set with a nerveless drop shot.
With the tension released, Murray began to strike the ball off the ground and on serve as he had in his demolition of Thanasi Kokkinakis on Friday.
The world number three's defensive skills were proving an offensive weapon too, with brilliant scrambling helping him to break for 3-1 in the second set as a bewildered Tomic netted a smash.
Unable to find a way through the wall across the net, Tomic dropped serve to love early in the third, and Murray then began to show off the full repertoire of aces, winners and drop shots.
A fifth break of the afternoon was secured to give him two chances to serve out the match, and he only required one, taking Britain back to the final when a Tomic return flew wide.
Jamie and Andy Murray after their doubles win yesterday