If Belgium win this match then Belgium can play in the next round. But it doesn't seem that Belgium can win this match. I think Croatia will win this match. We have seen that Croatia played very well in previous matches, today if Croatia can play well then Croatia will win.
The outcome of this match is very hard to predict for me, but i would also say that Croatia is the slight favorite in this match up against Belgium today for a few reasons. First of all Croatia is the reigning vice world cup champion which is a pretty great achievement, so they definitely have a lot of class in their squad. Also they looked stronger so far in this tournament then Belgium in my opinion. Also i think this tournament is probably the last chance for Belgium to finally win a title or to at least reach the semi-finals or something because the players of their golden generation are now all older then 30 now, so i doubt that they will play another world cup.