Every day of 2012 Olympics action is sure to provide a new storyline. National heroes rise to prominence, underdogs shock the competition and heavy favorites fail to meet expectations.
We're kicking off a day-by-day ranking of the most impressive performances by individual nations. The scales for judgment aren't exactly even, as some countries compete in a tremendous amount of events (China, Brazil, U.S., etc.) and others have limited opportunities to make their mark on the 2012 London Games.
In essence, we're favoring quality over quantity when compiling these lists. With that in mind, here's a look at the nations who shined on the opening day of Olympic-medal competition.