Great Britain Davis Cup captain Leon Smith said he was "extremely proud" of his team after the 3-2 semi-final defeat by Argentina in Glasgow.
Britain hit back from 2-0 down to force a decider, but Leonardo Mayer beat Dan Evans 4-6 6-3 6-2 6-4 to seal victory.
It ended a seven-tie winning run that included last year's final - Britain's first Davis Cup triumph for 79 years.
"We've had an unbelievable run in this competition over the last couple of years," Smith told BBC Radio 5 live.
"I don't think people would have mapped that out a few years ago, what the team has achieved, so I'm extremely proud of them.