An early strike from Saul Niguez gave Atletico Madrid a 1-0 win over holders Liverpool in Tuesday's Champions League last-16 first leg at Wanda Metropolitano.
Atletico had won just one of their last seven matches ahead of this tie, but they took the game to Liverpool from the off and opened the scoring through Saul's fourth-minute strike.
Returning to the scene of their magical sixth European Cup triumph in June, the visitors dominated possession but failed to register a single attempt on target in response.
Just a third defeat in all competitions this season leaves Jurgen Klopp's men with it all to do in the return fixture at Anfield on March 11.