Teenage debutant Marc Guiu snatched champions Barcelona a 1-0 win over Athletic Bilbao just seconds after coming on from the bench on Sunday in La Liga, taking the Catalans up to third.
Xavi's Barca will face leaders Real Madrid next Saturday in the Clasico just one point behind their bitter rivals, and second-placed Girona, who beat Almeria 5-2 earlier on.
For a long time it seemed like Barcelona would not find the breakthrough against their Basque visitors but striker Guiu, 17, netted under a minute after being thrown on by Xavi.
The forward was slipped in by the silky Joao Felix and slotted past Unai Simon, who got a hand to his shot but could not keep it out.
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