Philippe Coutinho scored his first Barcelona goal as the Spanish side beat Valencia to reach a record fifth successive Copa del Rey final.
Coutinho, making his fifth appearance since a £142m move from Liverpool, came on in the second half and acrobatically steered home from Luis Suarez's cross.
That put Barca, cup winners in the past three years, 2-0 up on aggregate in the semi-final second leg in Valencia, before Ivan Rakitic added another.
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Barca will face Sevilla in the final.