Celta de Vigo - Real Madrid

Villarreal had a good preparation for the season, but once it started, that form disappeared. They played 5 matches including CL and lost all of them without scoring any goals. The offense is working well, there are no complaints there, as they have scored at least 2 goals in 4 matches. The problem lies in the defense, as they have conceded at least 2 goals in 4 matches as well.
Betis started the season with 9 points, winning 3 out of 4 matches including against Real Madrid and their CL opener. However, it should be noted that they have only conceded 1 goal in total, thanks to their strong defense.
Their home team hasn't started yet, but the warning bells will start ringing if their form doesn't improve. This is a favorable team to score against.