It's impossible for Uruguay to win Group C in the 2011 Copa America after Chile's win in the early match, while Mexico could never win the group, but there are still three different scenarios in play for tonight's game. Uruguay and Mexico both have a chance to advance, and Uruguay can do it with just a draw. Pending Group B's results, a draw might actually be more beneficial than a win. Confused? I can explain.
If the match is a draw: Uruguay advance in third place and Mexico is eliminated. It is possible that Mexico could face any of Colombia, Paraguay, Brazil or Venezuela.
If Uruguay win: Uruguay advance in second place and Mexico is eliminated. Uruguay would play Argentina.
See why a win might not be a good thing? Obviously, Uruguay are wading in dangerous waters if they play for 0-0, but a win isn't actually in their best interests. Though, the neutrals probably won't mind a Uruguay-Argentina quarterfinal.