BBC Sport explores what is behind Belgium's progress to the last eight of the World Cup, and whether they were too easily discounted among the contenders.

Thibaut Courtois and Romelu Lukaku both played in the 2014 World Cup for Belgium and had key roles in their last-16 victory over the USA this time around When the World Cup began 30 days ago, few believed Belgium - shorn of so many of the star names who featured in their previous campaigns on this stage - were among the potential winners. Even fewer would have believed it when they were 2-0 down with 85 minutes played against Senegal in the last 32. But now the Red Devils are in the quarter-finals, having delivered one of the all-time great World Cup comebacks to vanquish the Senegalese, before following it up with one of the most impressive performances of the tournament so far in beating the USA 4-1 on their home turf. Eden Hazard, Mousa Dembele, Marouane Fellaini, and Vincent Kompany may be long gone, but a squad which still features Thibaut Courtois, Romelu Lukaku, Kevin de Bruyne and Axel Witsel has turned a mediocre start into a potential shot at glory. As they prepare to take on Spain for a place in the semi-finals on Friday (20:00 BST), were the Belgian golden generation written off too soon, or is manager Rudi Garcia harnessing their power in a different way? Belgium reached the quarter-finals in Brazil in 2014 and then the semi-finals in Russia in 2018 - when their team was arguably at its peak - but were wretched in 2022, eliminated in the group stage behind Morocco and Croatia. "I think this ​is a new era for us," Real Madrid goalkeeper Courtois, playing in his fourth World Cup, said before the USA victory.