It will be interesting to watch this match. If Atletico Madrid beats Barcelona, Real Madrid can easily get to the top of the standings. But I think that Barcelona will not give up three points in this match. Although, we will need to look at tomorrow's Barcelona game against Espanyol to understand their preparation for the continuation of the League.
I didn't watch the Atletico Madrid vs Elche match. however, when referring to the statistics of last night's match. this moment is the moment of Atletico Madrid's awakening, even though Elche is not a difficult opponent for them to beat. because after all, Elche is unlikely to be able to survive in La Liga with so many points dropping.
On the other hand, we haven't seen Barcelona's games in the second half of the season. Barcelona could slip up against Espanyol later, because we know that Lewandowski will be absent for 3 of his matches due to an accumulation of red cards.
As for the Atletico vs Barcelona match, which will be held in January, we can't predict anything yet because after all, it's like I said before. we don't know Barcelona's game in the second half of this, especially when referring to the prediction of Barcelona's line-up later. it seems, Xavi will rotate several players such as Ansu Fati, Gavi and Ferran Torres. however, the accuracy of this prediction cannot be guaranteed. so, let's just wait for Barcelona to play their match vs Espanyol.
Therefore I think they will defeat Espanyol even easier now with Lewandowski. 
