How to create this app

I am creating an app based on a television matches that will be played where there are multiple teams each team will play knockout round and move ahead if they win, however if the team loses the match then they are out of the league. Here every user will select their own team who think will win. Is this possible

From experience, it’s fairly complex to build a social, automated, tournament style app, but it’s possible.

can you give an idea?