I don't think a 3-0 was all about getting lucky, they played their might to be on the Finals again but I hope they won't fall short this time just like in 2014. They might not be the favorite in this World Cup but they have the chance now and they're just waiting on who will won on another bracket. More chance to practice and to study opponents that they'll up against in the Finals.
The score from the 3-0 win is certainly not something lucky except for the score of 1 goal from a penalty kick, Croatia's performance has decreased in this match and I didn't expect them not to do anything potential to score goals even in the second half they seemed to be playing in the friendly league without thinking about losing 3 goals . Brazil should have deserved to face Argentina in the semi-finals but Brazil was unlucky on penalty kicks.