David Ferrer ensured Spain advanced to their second successive Davis Cup final after a four-set defeat of the United States' John Isner.
With Rafael Nadal absent due to injury, the onus was on Ferrer to deliver for Spain and he rose to the challenge to hand the hosts an unassailable 3-1 lead in Gijon.
Ferrer owns a 21-4 singles record in the Davis Cup and is unbeaten in 16 matches on home soil.
Spain captain Alex Corretja told the Davis Cup website: "He's a guy who never gives up, he's a gladiator and he knows the way he needs to play on clay, the way he needs to move and hit the ball.
"On clay, it's very difficult to beat him. Of course, on hard courts, indoors too, but here especially because he's very strong."
Isner hinted at a USA comeback when he claimed the opening set on a tie-break but Ferrer's greater consistency from the baseline saw him emerge a 6-7 (3/7) 6-3 6-4 6-2 victory.
"I'm very happy and this is a dream for me," Ferrer said. "Another Davis Cup final. We were here in Gijon at home, I won the last match and I won over John Isner who is a very, very good player."
USA captain Jim Courier could not have asked any more of Isner but the world number 10 failed to take the limited opportunities which came his way.
Isner said: "I had a few chances and if I was to capitalise on those chances the match could've been a little different. I'm more comfortable when I feel like I'm playing ahead and I would've liked my chances then, but it wasn't to be.
"I gave him an inch and he took about 20 yards. He was very good today. He returned my serve exceptionally well and made me return a lot of balls and in the end he was the better player."
In the final, Spain will travel to the Czech Republic in a rematch of the 2009 title encounter after Tomas Berdych inspired his country to victory in Argentina.
Berdych was too strong for Carlos Berlocq, standing in for the injured Juan Martin del Potro, in today's opening rubber as the visitors built on their 2-1 overnight advantage, winning 6-3 6-3 6-4.
"We made it and that was the goal we brought in here, to try the almost impossible and try and win here," Berdych said. "The whole team had that belief that we could make it. It's not impossible to win in Argentina as we proved.
"That's even better to win with such a crazy crowd in probably giving us so much for the future and I'm really excited to be in the final again."
