Real Sociedad 1-4 Barcelona: Robert Lewandowski scores first two competitive goals for Barca

Robert Lewandowski scored his first competitive goals for Barcelona on his 34th birthday as the Catalan club recorded their first La Liga win of the season.

He scored his first goal after only 47 seconds.

Alexander Isak's shot looped in and he tied the game six minutes later.

Ansu Fati calmly added a fourth after Ousmane Dembele's low drive made it 2-2.

• Relive Real Sociedad v Barcelona as it happened

The draw at home to Rayo Vallecano was the first point of the season for Barcelona.

One of their new signings, Raphinha, came on as a second-half substitute, despite the fact that he only had a year left on his contract.

Jules Kounde's transfer from Sevilla at the end of July made him ineligible to play for Barcelona as he hasn't been registered yet.

Barcelona will play Manchester City in a friendly on Wednesday and will play a game against Valladolid on Sunday.