Barcelona have suffered their first loss of the Spanish football season, going down 1-0 at Athletic Bilbao.
Barca were without the injured Lionel Messi, and turned in probably their worst performance of the campaign.
It follows a 2-1 Champions League loss at Ajax Amsterdam.
It was only the second time in 15 matches this season that Barca have dropped points and they are now level with Atletico Madrid at the top of La Liga, though ahead by two goals.
Real Madrid are three points back.
