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Real Madrid have 3 points ahead of Barcelona so if the match between Barcelona and Atletico ends in a draw, then Real Madrid will have the first position for the time being. The match against Villarreal was quite tough for them, and I think if only Villarreal had a more clinical finish, maybe the game could have ended in a draw. Real Madrid were fortunate their opponents did not have a good finishing touch, and Ancelotti really should do an evaluation for their back line because their defensive coordination looks quite messy, and maybe that could be the reason they failed to win in the following matches.
Indeed, at this time Real Madrid is already 3 points ahead of Barcelona, so that at this time Real Madrid is at the top of the standings. However, one thing that must be considered is that Barcelona has only played a total of 26 matches, while Real Madrid has played 28 matches, in other words Barcelona has two more matches than Real Madrid, so even if they are only able to achieve a draw when facing Atletico Madrid or even worse Barcelona loses in the match. Barcelona still has the opportunity to be able to catch up with Real Madrid, so that at any time Barcelona can take over the top of the standings again.