Substitute Saul Niguez scored a spectacular overhead kick for Atletico Madrid who tore apart local rivals Real Madrid 4-0 to open up the La Liga title race.
Real, who were missing key players defensively, began sluggishly and goal-keeper Iker Casillas was at fault as he allowed a Tiago Cardoso shot from the edge of the area to slip under his right hand after 13 minutes.
The goal still did not wake up Real who quickly conceded another from Saul who had come on for the injured Koke.
Guilherme Siqueira tore down the left wing, Saul met his cross with a bicycle kick and the ball flew in off the post.
Atletico continued to create chances and Antoine Griezmann went close several times before bundling in a Saul header from close range with Raphael Varane slow to react after 66 minutes.
Mario Mandzukic further punished the Real defence with a header from a Fernando Torres cross after 89 minutes.
Atletico have now beaten Real in the domestic Super Cup, twice in the league and knocked them out of the King's Cup since losing the Champions League final to their neighbours last season.
Real lead the table on 54 points while Atletico go level on 50 with second-placed Barcelona who face Athletic Bilbao on Sunday.