#1 Belgium counter-attacks will not work against Brazil
Belgium has a squad that contains fast and pacy players such as Romelu Lukaku, Kevin De Bruyne, and Eden Hazard. This makes them especially lethal on the counter-attack. An example of this is Belgium's winning goal against Japan when Belgium counter-attacked following a Japanese free-kick in the dying minutes of the match.
But it will be much more different and much more difficult against Brazil. Brazil's first choice left-back, Marcelo, was injured during their last group match against Serbia and thus Filipe Luis replaced Marcelo in their Round of 16 match against Mexico. Luis is a much more defensive-minded left back than Marcelo and thus will prioritize defense more than attack. If Luis starts against Belgium, then he will be ready for any counter-attacks.
Another important thing that was noticed in Brazil's match against Mexico was that Brazil's center-Backs, Thiago Silva and Miranda, were not involved when Brazil were taking set-pieces. Instead of going ahead, they stay back in case of a quick transition. This was crucial for Brazil's defense and as both Mexico and Belgium are good on counter-attacks, expect Brazil to continue this defensive strategy and with both the center-backs in defense, Belgium will have a hard time trying to score a goal against a team that has conceded just 1 goal this World Cup.