I think the favourite right now is Real Betis. They are 3rd on the league and their last 4 games has been:
2-1 win against sevilla in the 1/8th of copa del rey.
4-0 Againt Alaves in la liga
1-4 against Espanyol in la liga
0-4 against Real Sociedad in the 1/4th of copa del rey.
I think Betis is...