Real Sociedad fell to a narrow 0–1 defeat against Rayo Vallecano on Sunday, 5 October 2025, at the Anoeta in a La Liga Matchday 8 fixture that kicked off at 16:30 UTC. The match remained goalless at half-time before Rayo Vallecano found the decisive second-half strike to claim all three points. Jose Luis Guzman Mansilla of Spain served as the referee for the contest.

For Real Sociedad, the defeat at home was a significant setback at this stage of the campaign. The loss left the Basque side sear...