Diego Milito scored the lone goal in the 57th minute, but Zaragoza could have made the decision even more lopsided if they had done a little better in the finishing department. The loss allows Sevilla to move ahead of Barcelona with a win against Racing on Sunday.

Andres D'Alessandro threatened the Barca net with a pair of free kicks, but his shot in the 25th minute sailed over the top and his 27th-minute effort was stopped well by keeper Victor Valdes.

The home side continued to pressure, and Sergio Garcia sent a low shot just past the right post, before a nice ball from Carlos Diogo gave Garcia another opportunity, but he could not keep his shot down.

Despite being outplayed in the opening 45 minutes, Barca were on even terms, and began the second half with a good spell of play. Ronaldinho set up winger Ludovic Giuly for a shot that was blocked, and the Frenchman pounced on the rebound and let loose another effort that was stopped by keeper Sanchez Cesar.

Cesar was called upon just minutes later when a strong shot from Deco needed to be turned aside for a corner.

After the brief bright spot, however, Barca fell behind in the 57th minute. D'Alessandro took the ball to the end-line and then chipped a cross towards the near post for Milito. He got the slightest of touches on the ball and did enough to poke it past a sprawling Valdes, putting Zaragoza in front.

Eidur Gudjohnsen was brought on with 25 minutes to play, and he should have been able to grab the equalizer in the 73rd. Leo Messi's shot from inside the penalty area was cleared off the line, but it fell to Gudjohnsen, who was positioned just five yards from goal. The Iceland international would bury the rebound on most days, but he pulled it wide, squandering Barca's best chance of the match.

In Saturday's other contest, Athletic Bilbao surprised Valencia with 1-0 decision to help Athletic climb out of the relegation zone.

On Sunday, Deportivo hosts last-placed Gimnastic while second-to-the-bottom Real Sociedad visits Espanyol. Bottom-half clubs Levante and Real Betis meet up at Ciudad de Valencia, Getafe tries to stay in the top half with a win against struggling Mallorca, Recreativo tries to keep its hopes alive for a spot in Europe when Celta Vigo comes to town, third-placed Real Madrid hosts Osasuna and Villarreal tries to move out of the middle of the table with a win on home soil against Atletico Madrid.