For the upcoming games of Real Madrid, Barcelona and Atletico Madrid I can say that I'm confident about the first and last one to win. However I'm not confident about Barcelona as much as them in their next game. Because it is an away game against Vallecano. Barcelona lost to them 3 times and got a draw in their last 4 head-to-head games in the La Liga.
Barcelona will play without its main goal keeper. I can still tolerate if barcelona will play without gavi but not for ter stegen. this guy is really important for the club but that's pretty sad barcelona was missing him due to the injury. Vallecano was not as strong as top club but this club may able to prevent barcelona to get full points. Barcelona needs be careful with rayo. This team was able making real madrid struggle to beat it.
The possibility owned by barcelona is quite high combined it has pretty small odds but that's good enough. Im thinking of picking barcelona even though barcelona may only able to win the game with narrow score.
Vallecano are holding a psychological advantage in hand because of that. In addition to that Real Madrid couldn't do better than drawing with Vallecano not long ago as well. Combining all of this it seems a little risky to bet on Barcelona here. 
True and rayo can also do the same against barcelona. Going to be all defensive and it will be effectively reducing barcelona's attack. Barcelona was always going all offensive against its opponent. Rayo can see an opportunity to beat barcelona through counter attack.