Real Sociedad moved up to third on Friday after defeating Real Valladolid 1-0 in San Sebastian.
Adnan Januzaj was the Basque team's hero when he netted the only goal of the game on the hour mark.
The race at the top of the table continues this weekend between champions Barcelona and Real Madrid.
Spain's two giants face off in El Clasico on Sunday at the Camp Nou, with the winners taking control at the La Liga summit.
La Liga Standings (played, goal difference, points)
1. Barca: 25, 33, 55
2.