Gerard Pique opened the scoring for Barca in the 19th minute with a powerful header from Memphis Depay’s free-kick.
Martin Braithwaite scored either side of half-time to become the first Danish player to score a La Liga brace.
Real Sociedad pulled it back to 3-2 through Julen Lobete and Mikel Oyarzabal’s spectacular freekick to set up a tense finale.
However, Sergi Roberto added a fourth for Barcelona in added time courtesy of Braithwaite’s assist.
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