It seems Brazil could have made it here with an empty net, I don't think that Alisson guy has had to make a save in this tournament.
With that being said, Brazil remains Brazil, which means they're vulnerable from set-pieces and Belgium could hurt them on that.
From a Belgium standpoint, it' s quite frankly appalling that three out of their four leaders in attack didn't show up for the first game of the knockout stages (Lukaku appeared at times to miss sitters). So after Panama, Tunisia and Japan, what can be expected from Mertens, De Bruyne and Lukaku against Brazil? ( I expect Hazard to bring the goods)