Tommy Robredo and Feliciano Lopez upset Israeli doubles specialists Jonathan Erlich and Andy Ram 7-6 6-7 6-4 6-2 to put champions Spain through to their fifth Davis Cup final in 10 years.
Juan Carlos Ferrero and David Ferrer had opened a 2-0 lead for the home side with crushing victories in Friday's singles before Robredo and Lopez gave Spain an unassailable 3-0 advantage in the best-of-five tie on the clay in Murcia.
Spain, winners in 2000, 2004 and 2008, will play Czech Republic at home in December's final after making light of the absence of injured world number two Rafael Nadal and Fernando Verdasco.
Czech Republic reached the Davis Cup final for the first time when Radek Stepanek and Tomas Berdych beat Marin Cilic and Lovro Zovko 6-1 6-3 6-4 to open an unassailable 3-0 lead over Croatia on Saturday.
