MADRID, Sept. 16 -- FC Barcelona are the only club in Spain to maintain their 100 percent record following the fourth round of matches in the Liga Santander over the weekend.

The return to league action after the international break presented Barca with a difficult trip to face Real Sociedad, who were playing the first game in their newly renovated Anoeta Stadium.

An emotional day was made even more so as the home fans paid homage to striker Imanol Agirretxe, who was forced to retire at the start of the season due to injury.

Real Sociedad were clearly motived or the game and with Barca resting Sergio Busquets and Phillipe Coutinho, the visitors were lacking fluidity and Aritz Elustondo put them ahead in the 12th minute with a powerful shot following a free kick.

Busquets and Coutinho were soon in the action in the second half, but Real Sociedad would have doubled their lead if Juanmi had been more clinical in front of goal before two bad errors from home keeper Geronimo Rulli gifted Barca the win.

Rulli missed two high balls in his area to leave first Luis Suarez and then Ousmane Dembele with simple chances to score and what could have been a memorable win for Real Sociedad turned into Barca's fourth win in four matches.

Real Madrid were unable to keep pace with Barca after being held to a 1-1 draw away to Athletic Club Bilbao, whose young goalkeeper Unai Simon produced an impressive display.

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