Sports betting always has a surprise result that rarely happens but will be profitable for bettors who dare to take the risk of betting on the underdog during the match. For example, Mainz vs Munich and the bookmaker gives very large odds to Mainz as the underdog team. When the match starts and Munich makes several attacks, Mainz's odds increase to be very large and bettors dare to bet on Mainz's victory and end up with the underdog team winning.

I rarely do that but I remember doing it a few times on local sites betting during the game when the odds were around @8/@10 with a bet of around $0.1 and managed to win. But after that I never did it again and focused on lower odds and betting before the game started.