There will be a tied match which could be for a side or the other because of counter-attacks, or penalties. There won't be a big difference between France and Argentina, but as i'm from Argentina i'll hope the victory.
On the other hand, i'm COMPLETELY sure that Mexico will beat Brazil. I have no doubt regarding to this - no one.
Portugal - Uruguay, a tied match as well, if Uruguay plays PERFECTLY they can beat Portugal but i'll go for the luso team. I believe Cristiano Ronaldo will make the difference; though, i'll support Uruguay.
Spain - Russia, nothing to say, the candidate will win.
Croatia - Denmark, victory will be for Croatia.