Barcelona turned on late to cruise to a 3-5 win over Granada as Ronald Koeman's men continue to take the "shortest route to a cup" into the Copa del Rey semifinal on Wednesday.
Antoine Griezmann scored a brace and provided two assists as Barcelona staged a stunning last-gasp comeback before beating Granada away.
Granada were 2-0 up with two minutes remaining thanks to strikes from Kenedy and Roberto Soldado in either half.
But Griezmann, who had surrendered the ball in the build-up to Soldado's goal, pulled Barca back into contention in the 88th minute and then set up Jordi Alba's stoppage-time equaliser with a glancing header which the defender nodded home.
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The French forward gave Barca the lead 10 minutes into extra time and even though a Fede Vico penalty moments later restored parity, Frenkie de Jong put Barca back in front in the 108th before a stunning volley from Alba, served up by a cross from Griezmann, clinched the Catalans' place in the last four.