I think Croatia could make some difficoulties for Brasil, but in the Brasil will win with 2 or 3-0 result and goals will be scored in the key moments of the match, Brasil will take the lead then Croatia will try to attack and in the moments in which Cro should score Brasil will hit them with another goal and it will be 2-0. Thats my prediction, I could be right or terribly wrong
I think French or Spain will fumble, after watching their last friendlies (France hardly beat China, and Spain showed nothing special against Croatia despite win) they are my best candidates...