Villarreal striker Luciano Vietto stunned Atletico Madrid with a late winner last night at the Vicente Calderon.
Vietto's solitary late goal took all three points for Villarreal and inflicted a first home league defeat on Diego Simeone's side since March 2013.
Los Rojiblancos were left cursing their luck as Mario Mandzukic had a goal harshly ruled out at the start of the second half.
But Villarreal were more than a match for the league champions and were worthy of the 1-0 win, which ended Atletico's run of 27 league games without defeat at the Vicente Calderon.
The defeat will be all the more galling for Simeone, who handed a 17-year-old Vietto his debut in professional football back in 2011 while in charge of Argentine side Racing Club.