Real Madrid scored late in the second half to beat Real Valladolid 1-0 in La Liga and take over sole possession of first place from Barcelona on Sunday.
Zinedine Zidane's side took advantage of the chance presented to them by Barcelona on Saturday after the Catalans came out on the wrong side of a 2-0 result away to Valencia.
However, the result did not come easy as the hosts made Los Blancos suffer throughout much of the game until Nacho popped up in the 78th minute to head home a Toni Kroos cross for the lead.
Real midfielder Casemiro thought he had given Zidane's side an early lead when he headed home a free kick from Kroos but the goal was ruled out for offside after a VAR review.
Valladolid's Sergi Guardiola meanwhile netted late in the game but that was also ruled offside and Real clung on to earn a vital victory.
Real, who have not won the title since 2017, lead the standings on 46 points after 21 games while Barca are second on 43 and Sevilla third with 38.