Barca took the lead in the second leg of the derby against Atletio with the equaliser.
Barcelona had already drawn 2-2 on aggregate at the Camp Nou in the first leg, but this time they held on to beat the reigning Champions.
Mario Suarez scored a goal and then Diego Godin added an equaliser for Atleticos.
Barca’s Juanfran scored a late equaliser to seal the victory.
After the match, Suarez said: “I am very happy.
This is the best I have played all season.”
Barcelona are in the final two of the Copa del Rey, having already reached the semi-finals.