Barcelona have one leg in the Copa del Rey final following a 2-1 first-leg victory against Atletico Madrid at the Vicente Calderon.
First-half strikes from Lionel Messi and Luis Suarez secured the victory that puts the holders in control of the semi-final ahead of the return match at Camp Nou next Tuesday.
Diego Simeone's side have had success against Barca in recent years with a devastating counterattacking style however Barca used the same tactic here in the first half.
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The Madrid club were punished by a brilliant run and finish from Suarez with only seven minutes played.
Messi made it 2-0 with a ferocious strike from the edge of the penalty area to silence the Calderon.
The 2013 winners did show some improvement after the break, however, and Antoine Griezmann halved the deficit just shy the hour mark.
But Barca - who almost snatched a third through a Messi free-kick - held firm in the closing stages to see out a crucial win that will make them firm favourites to reach a fourth final in as many seasons.