This World Cup 2026 quarter-final presents the ultimate tactical puzzle: the tournament's deadliest attack — Belgium averaging 2.6 goals per game with Lukaku, De Ketelaere, De Bruyne and Trossard all capable of brilliance — against the tournament's most impregnable defence, which has not conceded in 450 minutes of World Cup football across all five matches. Spain have been relentless in their control under Luis de la Fuente: a clean-sheet draw vs Cape Verde, then four straight wins including a 4-0 demolition of Saudi Arabia, 1-0s over Uruguay and Portugal, and a 3-0 dismantling of Austria. Their defensive machine — Laporte, Cubarsí, Cucurella, Porro with Rodri and Pedri shielding — is the closest thing to an immovable object in world football right now. Belgium arrive full of fire after demolishing the USA 4-1, but Amadou Onana's devastating ACL injury rips out their midfield pivot. Squawka's model gives Spain a 64% single-match win probability, backed by all major bookmakers at odds of -163 (bet365). FootballPredictions.com predict Spain 2-0. 22Bet recommend Spain Asian Handicap -0.25 as the banker play. Our verdict: Spain control possession, limit Belgium's transition windows, and Oyarzabal provides the decisive goal in a tight 1-0 triumph.