It just happens for Mbappe to be able to win an important trophy since the first official game he will play for Real Madrid.I think he will be a lucky player to achieve such feat and I think Real Madrid is more than capable to beat a team like Atalanta which is playing for the first time in their history at such levels.I am confident Real will win the Super Cup as I remember them being down by Napoli a much stronger team than Atalanta and they changed things around within 16 minutes left to play,so based on this I doubt they will have any problems against Atalanta.
Not forgetting that this same Atalanta dealt with Leverkusen, now they are to face Real Madrid in this final, once again should we doubt their capacity but at it's realest if we compare, Madrid is a much tougher opponent than Leverkusen so we can in a right sense take Madrid on a straight win against Atalanta in this final even with the involvement of Mbappe it should be an easy win for them. It will be too bad for Mbappe to having lost a final on his first official game/final, then something bad is going to tell on his reputation at Madrid.