Andy Murray has sealed a quarter-final berth for Great Britain in the Davis Cup as Australia and Kazakhstan also joined already qualified France and Serbia.
Defending champions Switzerland kept their quarter-final hopes alive by drawing level 2-2 with Belgium in Liege.
Scot Murray, the world No.5, claimed a 7-6 (7/4) 6-3 7-6 (7/4) victory over US No.1 John Isner in Glasgow.
The win clinched a 3-1 triumph and set up a final-eight meeting in July against last year’s runners-up France, who advanced 3-2 past Germany in Frankfurt.
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.
The world’s No.1 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.
Switzerland, missing big guns Roger Federer and Stan Wawrinka, drew level 2-2 in Liege after Henri Laaksonen survived a five-setter against Belgian Steve Darcis 6-3 3-6 3-6 7-6 (7/5) 6-1.
Michael Lammer will bid to seal the winning point for the Swiss when he plays David Goffin in Sunday’s final reverse singles.
The winner will face either Canada or Japan.
Canada were in control in Vancouver after Daniel Nestor and Vasek Pospisil outlasted Japan’s Go Soeda and Yasutaka Uchiyama 7-5 2-6 6-3 3-6 6-3 to put the hosts up 2-1.
That means 2014 US Open runner-up Kei Nishikori, ranked fourth in the world, will be fighting to keep Japan alive when he takes on world No.6 Milos Raonic in Sunday’s first reverse singles match.
Both Raonic and Nishikori won singles matches on Friday.
In Ostrava, Bernard Tomic beat Lukas Rosol in straight sets to give Australia an unbeatable 3-1 lead over the Czech Republic.
In a clash of the teams’ No.1 players, Tomic, the 22-year-old world No.38, saw off 29-year-old Rosol, ranked 31, 7-6 (7/4) 6-3 7-6 (7/5) in two hours and 13 minutes.
Australia now take on Kazakhstan who squeezed past Italy 3-2 in Astana.
Aleksandr Nedovyesov, 28, sealed the winning point for the Kazakhs, beating Fabio Fognini 7-6 (7/5) 3-6 4-6 6-3 7-5 after Mikhail Kukushkin earlier beat Andreas Seppi 7-6 (10/8) 6-0 6-4.
Serbia, who had advanced unbeaten on Saturday, completed a 5-0 rout over Croatia in Kraljevo with Filip Krajinovic easing past Franko Skugor 6-4 6-2 and Viktor Troicki beating Mate Delic 6-4 6-3.
Serbia will next face South American opposition with Brazil leading Argentina 2-1 in Buenos Aires after Marcelo Melo and Bruno Soares defeated Diego Sebastian Schwartzman and Carlos Berlocq 7-5 6-3 6-4 in doubles.
In Frankfurt, hosts Germany saved face by winning their final reverse singles rubbers against France – Jan-Lennard Struff beating Nicolas Mahut 7-6 (8/6), 6-3, and Philipp Kohlschreiber sing off Gilles Simon 7-6 (7/5), 6-4.
France had assured themselves of a quarter-final berth when Julien Benneteau and Nicolas Mahut posted a 6-4 6-3 6-2 doubles success over Benjamin Becker and Andre Begemann on Saturday.
