Costa Rica 3, Uruguay 1: Biggest upset of the Cup so far.  The defending South American champs, and 2010 semifinalist, controlled the first half in their return to the country that hosted their last World Cup title, only to collapse in the final 45 minutes.  The Ticos scored two goals four minutes apart to shock Uruguay, and perhaps answer why the US was so dead-set on playing its qualifier last year in a snowstorm.  Uruguay, on the other hand, played without Premier League scoring leader Luis Suarez, and effectively answered in the affirmative all the questions about whether they had passed their sell-by date three years ago.