Spain have not enjoyed many good memories at the World Cup since winning their first and only title in 2010 as a group-stage exit in 2014 was followed by successive last-16 eliminations in 2018 and 2022.
However, manager De la Fuente has built a side capable of competing at the highest level once again, with their Euro 2024 triumph evidence of their prowess.
So it was no surprise La Roja were among the pundits' World Cup favourites - and are just two wins away from the title.
But the fact remains they are yet to hit top gear at this tournament.
After edging Portugal 1-0 with an injury-time Merino winner, they were again sluggish in another last-gasp success.
Belgium were up against it before the start of the last-eight tie. With Amadou Onana ruled out having ruptured his ACL in the 4-1 win over the United States, captain Youri Tielemans was injured in the warm-up to leave their midfield shorn of two quality players.
Yet Garcia's side stood firm against the Spaniards, who had few clear-cut chances after their opener and will need to find a higher level if they are to overcome two-time champions France.
Their defence, a major strength in this tournament, finally cracked, while Lamine Yamal has still yet to hit his stride.
The teenage forward tested Courtois on a couple of occasions, while also hitting the side-netting with another opportunity after some neat footwork on the edge of the box.
But apart from a role in the Ruiz goal and a few flashes of brilliance, he was largely on the periphery of the action and Spain will expect more from the Barcelona star, who will turn 19 on the eve of the semi-final.
For Belgium's 'golden generation', this was to be a painful exit as they again failed to fulfil the potential to land a major trophy.
This is likely to be the last World Cup for a host of their players, including keeper Courtois, Kevin de Bruyne, Thomas Meunier and Leandro Trossard.
So too record scorer Romelu Lukaku, who was unable to inspire another comeback from the bench to add to his three-goal tally at the tournament.