Substitute Mikel Merino delivered a dramatic stoppage-time winner as Spain edged Portugal 1-0 to reach the World Cup quarter-finals, ending Cristiano Ronaldo’s hopes of lifting the game’s biggest prize. In a cagey last-16 tie rich with tactical nuance and goalkeeping excellence, La Roja’s patience finally told when Merino arrived late to steer home the decisive blow after a sustained spell of Spanish pressure. Spain might have been ahead inside eight minutes. Dani Olmo slipped a clever first-time pass that split the back line and released Mikel Oyarzabal, who had timed his run perfectly with Renato Veiga keeping him onside. But the forward dragged his left-footed finish wide with only Diogo Costa to beat. That let-off sparked Portugal, yet it was Spain who continued to craft the clearer chances. Costa was outstanding throughout the first half, producing a brilliant double save on 16 minutes. The Portugal goalkeeper first pushed away Lamine Yamal’s curling effort bound for the far corner, then sprang across to tip an Alex Baena strike around the post. Portugal nearly delivered a sucker punch before the interval from a short-corner routine, as Nuno Mendes thundered a drive that Pedro Porro diverted onto the crossbar with a desperate defensive header. The restart brought an early setback for Portugal when Mendes pulled up after sliding in to block a Yamal cross, forcing Nelson Semedo into action and tasking him with the unenviable job of shackling Spain’s teenage winger. Baena soon tested Costa again with a low drive as Spain tightened their grip on territory and tempo, circulating the ball and probing for gaps while Portugal sought moments in transition. Rúben Dias and his fellow defenders coped manfully with wave after wave of Spanish possession, and Ronaldo worked tirelessly up front, but clear sights of goal for the Seleção were scarce. As extra time loomed, Spain finally cracked the code. A rapid switch of play and a measured delivery found Merino arriving at the perfect moment; the midfielder’s composed finish nestled beyond Costa and sparked Spanish celebrations. The late breakthrough sealed Spain’s passage to the last eight and brought a cruel end to Portugal’s campaign, and with it Ronaldo’s World Cup dream. For Spain, control, resilience and a decisive contribution from the bench proved enough on the night.