The win extended Sociedad's unbeaten run to 16 games in all competitions and saw them reclaim top spot in the standings with 28 points after 13 games, one more than second-placed Real Madrid who have played 12.
Real Madrid furious over Kylian Mbappe's PSG U-turn, but they know how to channel it after Neymar joined Barcelona
Missing out on signing Neymar in 2013 sparked a revolution at Real Madrid. Will Kylian Mbappe staying at PSG lead Los Blancos to greater heights?
Kylian Mbappe on rejecting Real Madrid: My decision based on PSG's 'sporting project,' not money
Kylian Mbappe said Paris Saint-Germain's "sporting project" rather than money convinced him to snub Real Madrid and sign a new deal at the club.
Real Madrid, Liverpool lead Aurelien Tchouameni chase - sources
Real Madrid and Liverpool are the two clubs best-placed to sign Aurelien Tchouameni this summer, sources have told ESPN.
Could Real Madrid target Salah after missing out on Mbappe?
Gab & Juls debate who Real Madrid could look to sign after Kylian Mbappe extended his contract at PSG.
Barcelona eye Ruben Neves, Martin Zubimendi as potential Frenkie de Jong replacement - sources
Barcelona will target midfielders Ruben Neves or Martin Zubimendi should Frenkie de Jong leave the club this summer, sources have told ESPN.
Yorke: All Stars have free shot to attack Barcelona
All Stars coach Dwight Yorke is hoping to throw attacking football at a Barcelona side that will be short on preparation time.