Atletico Madrid were in dreamland as they destroyed rivals Real Madrid with a thumping 4-0 win which blew the La Liga title race wide open.
Tiago Mendes opened the scoring for the champions at a raucous Vicente Calderon after 13 minutes and substitute Saul Niguez doubled the lead with an acrobatic goal just moments after replacing Koke.
Antoine Griezmann and Mario Mandzukic added to the goal glut in the second half to leave stunned Real thoroughly humiliated.
The win saw Atletico cut the gap to league leaders Real to four points and gave Barcelona the chance to close it to just one if they win at Athletic Bilbao on Sunday.
This was the sixth meeting between the two clubs from the Spanish capital this season, with Real not managing to beat their derby rivals since winning the Champions League final last May.
Villarreal limped their way to a 2-0 win over strugglers Granada to keep the pressure on fellow Champions League chasers Valencia and Sevilla.
Mateo Musacchio broke the deadlock after the half-hour mark from close range but Granada refused to lie down after going behind and kept on searching for an equaliser until Gerard Moreno's last-minute goal made a home win certain.
Villarreal remain in sixth position but are now level on points with Valencia and a point behind Sevilla, with both sides in action on Sunday. Granada, meanwhile, remain in the relegation zone but on this evidence they will believe they have a good chance at survival.
David Barral's hat trick helped Levante moved off the foot of the table with a shock 4-1 win against Malaga.
Levante won for the first time in 10 games thanks to Barral's treble, two of which came from the penalty spot, and a goal from Kalu Uche.
Juanmi had given Malaga the lead but that was as good as it got for Javi Gracia's men, who are now six points adrift of a European spot.
In the late kick-off, Nolito's late strike earned Celta Vigo a 1-1 draw at Real Sociedad.
David Moyes' Sociedad began brightly and were in front in the eighth minute when Imanol Agirretxe headed home from close range, but Celta grew into the match and were well worth a point at the Anoeta Stadium.