As long as Argentina steps things up they can win, their group round was just terrible. The only thing that broke their curse was their first goal against Costa Rica, and after that they loosened up and played the way Argentina should play. I think Messi should just play with the team instead of looking for the goals Aguero is making.
(Ugh, Maradona as coach ... best not to mention that again, those were dark times.)
Regardless, Uruguay is a good match-up. Brasil and Paraguay also should be a good match, they're traditionally strong teams and last time they played they tied, so it's interesting to see what will happen now.
Tomorrow (today where I am) is Colombia vs. Peru. Rooting for Colombia since they've had a clean slate so far. Let's hope they keep it up.