Not only the bookies, majority of gamblers believed that Barcelona would win Rayo and they lost their bet. This is the reason why no team should be underestimated because no one can predict the future. I couldn't believe that Barcelona almost lost that game. Rayo has poor finishing and couldn't score more goals. A lot of work needs to be done in Barcelona defense because it looks porous to me.
There are many surprises in football and this is one of them and it must be admitted that Rayo Vallecano is a strong team when playing at home but if we measure the strength of both teams it is clear that this is a big surprise that happened at the beginning of the La Liga season this season although we should not be too excessive because on the one hand I see Barcelona as if they were unlucky so they could not bring out their best performance so I will not also respond to Barcelona's performance because in my opinion from this one match cannot be used as a reference for anything.
Frankly, I also didn't think that Barcelona would only get 1 point in this match because their squad is much more promising than Rayo Vallecano, and Barcelona also has a good record when facing Vallecano. But in football, surprises often occur, and that is what happened when Vallecano surprisingly managed to hold Barcelona to a draw. Barcelona's rhythm looks quite monotonous and they failed to dominate the game, and they didn't even have more shots on target than Vallecano.