Neymar scored his first league goal and helped Barcelona ease past Real Sociedad 4-1 in the Spanish league on Tuesday and stay perfect after six rounds.

The Brazil forward's fourth minute goal led to 20 minutes of intense pressure and two more goals that left Sociedad reeling at the Camp Nou.

Neymar made the most of hesitation between two Sociedad defenders and goalkeeper Claudio Bravo to rush forward and poke the ball into the goal.

''It doesn't matter that it was a scrambled goal, what is important is that it went in,'' said Neymar. ''The team is getting better all the time.''

Lionel Messi lunged headlong four minutes later to score past Bravo from Neymar's cross for his seventh league goal this season.

A minute later Bravo was forced to sprint forward and punch away a head-high ball as Neymar arrived alone into the penalty area.

Sociedad captain Xabier Prieto fell to the ground clutching his right thigh and had to be substituted in midfield by Imanol Agirretxe in the 21st.

Busquets scored Barcelona's third two minutes later after the ball had bounced off the crossbar from Messi's close-range shot.

Mascherano was substituted at half time by Marc Bartra, and Barcelona upped the pressure on Bravo, who was forced to save twice and watch another shot go just over the bar in a 10-minute spell.

Sociedad pulled one back when Agruirretxe beat Gerard Pique and passed the ball across the goalmouth for Alberto de la Bella to tap into goal past a stranded Victor Valdes in the 64th.

''One of our starting premises was not to allow them to score in the first few minutes, which is something we've done in other years, and look what happened,'' said de la Bella. ''Playing like this in the Camp Nou makes it very difficult for us.''

In the 76th minute, Messi dribbled past three defenders before crossing to Bartra who flicked the ball into goal to complete the rout.