Spain against Portugal, a game pitting two of the competition's most technically accomplished teams against each other, begins an enticing semifinal round at Euro 2012. The tie .
Spain have once again wowed fans and pundits with the assurance and quality of their passing. Portugal, meanwhile, have shown that when they abandon their rigid, defensive instincts, they have the attacking potency to match any team in the competition.
There should be plenty of attacking flair on display as Spain's technique and craft will be tested by Portugal's athleticism and power. Here are three key players to watch for each team.