Barca were enjoying 80 percent of possession, but didn' t score until the 42nd minute. Messi took a pass after a strong run from David Villa and calmly slipped the ball under the helpless Doblas.

Zaragoza needed to get into the game fast, but the second half got off to a dreadful start when Ponzio was sent off for hitting Dani Alves in an off the ball incident.

Replays showed Alves made a meal of the incident, but confirmed that the midfielder had clearly hit the Barcelona defender, who was nevertheless booed for the rest of the game by the home fans.

Zaragoza spent the rest of the game chasing shadows as Barcelona made the extra man count and keep possession. Doblas saved well from Messi in the hour and from Villa five minutes later.

He could do little with the rebound however, as Messi drilled home the loose ball to assure Barca' s fourth away win of the season.

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