PARIS: World No 1 Rafael Nadal blitzed hapless Andy Roddick inside a Madrid bullring on Sunday to lead Spain into a Davis Cup final showdown against Argentina.

Spain, the champion in 2000 and 2004, saw off defending champion United States 4-1 while Argentina, which has never lifted the trophy, needed teenager Juan Martin del Potro to deliver a gripping 3-2 win over Russia in Buenos Aires.

Nadal, who has already picked up the Wimbledon, French Open and Olympic titles this year, cruised to a 6-4, 6-0, 6-4 victory over Roddick to hand Spain an unassailable lead in the 22,000-capacity Las Ventas bullring.