By Ewan Murray Real Madrid are UEFA Super Cup champions again, moving ahead of rivals Barcelona with a sixth victory in the competition’s history. After a tepid first half, Real Madrid turned on the style after half-time and produced two quickfire goals to take the game out of Atalanta’s grasp. Federico Valverde tapped home the first with half-an-hour to play and Mbappe got the debut goal he was dreaming of shortly afterwards. Before a ball had even been kicked, Mbappe was already stealing headlines. The Frenchman was named in the Real Madrid starting lineup by Carlo Ancelotti for the first ti…