Real Madrid's response to winning the Clasico was another surprise defeat on Sunday as they lost 2-1 away at Real Betis to hand the initiative straight back to Barcelona.
Betis were deserving victors of a thrilling contest at the Benito Villamarin where two galling Madrid errors cost them their place at the top of La Liga, with Barca now two points clear.
A heavy touch from Sergio Ramos led to Sidnei's stunning opener for Betis and then Karim Benzema, who equalised with a penalty on the stroke of half-time, was at fault for their 82nd-minute winner.
Benzema's misplaced pass in midfield allowed Cristian Tello to go clear and he held his nerve to give Betis their first victory in eight games that adds yet another twist to this season's back-and-forth title race.
"We lacked everything today," said Real coach Zinedine Zidane.
"It was our worst game of the season. We lacked energy, fluency, possession, aggression. It was a bad day and that can happen. I am responsible. We can't lose our heads but we can't be happy either."
"We have to be self-critical. And now we have to wait for those above us to slip up."
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