When this Sunday the ball starts rolling in the World Cup final at the MetLife stadium on the outskirts of New York, the city that never sleeps, all eyes will be on two players trained in Barcelona, Lionel Messi and Lamine Yamal. The leaders of Argentina and Spain, the two finalist teams. It will be special for a group of people who, searching through old photos on their mobile phones, find some that show these two players when they were much younger: the coaches from La Masia who, in some way, helped them on both their paths to MetLife stadium.