Barca beaten at Real Sociedad as Liga title race tightens
Alexander Sorloth's towering header earned Atletico Madrid a narrow 1-0 win over Alaves on Sunday in La Liga, helping them pull level on points with third-placed Villarreal.
Barcelona, who hit the woodwork four times and had two goals disallowed, now only lead rivals Real Madrid by a single point at the top of the table after Alvaro Arbeloa's side beat Levante on Saturday.
Sociedad's Mikel Oyarzabal put the hosts ahead and immediately after Marcus Rashford equalised for Barcelona, Guedes struck the winner.