Portugal did not sit back and let Spain dominate them in those opening exchanges however.
Ronaldo's expected forays forward and some powerful running from Fabio Coentrao took the game to Spain and their Real club mate Alvaro Arbeloa was fully employed keeping them both at bay.
Spain threatened twice in the opening half hour with Arbeloa and Iniesta going close while at the other end Ronaldo fired a shot just past the post.
Spanish coach Vicente del Bosque started with the physically powerful Alvaro Negredo in attack rather than Cesc Fabregas but the "false number nine" came on early in the second half with Negredo having been well-marshalled by Pepe and Bruno Alves.
Image: Spain's Cesc Fabregas celebrates after scoring the decisive penalty shootout during the Euro 2012 soccer championship semifinal match between Spain and Portugal in Donetsk, Ukraine, Thursday, June 28, 2012.