Kolkata, July 12 -- Records will state Spain's World Cup invincibility lasted 649 minutes. But their conviction has been unshakeable. Spain conceded for the first time in this World Cup. For the first time they had to respond to a genuine challenge. Yet, if there was any singular moment on Friday that suggested Belgium had finally got through to Spain, it passed almost as quickly as it had arrived. For Spain simply resumed doing what they have done throughout this tournament - controlling the game, trusting their collective strength and eventually finding a way to win. Super sub Mikel Merino's late strike secured a 2-1 quarter-final victory in Los Angeles and a place in the semi-finals against France, but the significance of the win extends...