Real Madrid missed the chance to move back to within three points of LaLiga leaders Barcelona after being held to a goalless draw by unlikely title challengers Real Sociedad.
Carlo Ancelotti's side dominated for large parts but drew a blank at Santiago Bernabeu just three days after downing rivals Atletico Madrid in Thursday's Copa del Rey quarter-final.
Goalkeeper Alex Remiro starred with numerous fine stops amid a somewhat one-sided encounter, with Madrid unable to break the impressive resistance of Imanol Alguacil's team.
The stalemate left Los Blancos trailing fierce rivals Barca by five points, with third-placed La Real three behind Ancelotti's men after Sunday's clash.
Chances were plentiful amid a frantic and free-flowing opening between two in-form sides.
A stretching Alexander Sorloth could not reach Aihen Munoz's pinpoint left-wing cross with the goal gaping, while Vinicius Junior and Asier Illarramendi went close at either end.
Remiro repelled a fizzing Toni Kroos drive and Dani Ceballos curled just wide as Madrid failed to find deserved reward for an enterprising first half.
Vinicius saw another low strike denied by Remiro's feet and Thibaut Courtois thwarted a precise Takefusa Kubo attempt after the interval.
Remiro stood tall to parry from Vinicius when one-on-one with a save that proved pivotal as La Real held on for a precious point.