You're right the odd given to flaminense is not a true reflection how good flaminense is so anyone who can take the risk should try and bet on flaminense because this game is a 50/50 game I don't see Chelsea as that fantastic to the point of giving 5.72 odds to flaminense let see how this game will go a expect a close one from this game
The bookmakers see Chelsea as the favorite to win against Fluminense; that is why Fluminense was given higher odds than Chelsea, but sometimes odds don't determine the outcome of a game. If Chelsea can struggle to beat Palmeiras in the quarterfinal, I believe there is a chance for Fluminense against Chelsea tonight. Any gambler who feels that Fluminense has what it takes to beat Chelsea tonight can place his money where his mouth is.
Chelsea are not in a very good position right now, while Fluminense are in a great position, having extended their journey by beating Inter Milan. They played brilliantly in the group stage and knockout stage matches and qualified for the semi-finals as a worthy team. That is, they defeated their opponents in a competitive match and qualified for the semi-finals. On the other hand, Chelsea's journey is not very strong. But they will definitely play on their name and try to show their strength. They are still quite strong, especially in an important match like the semi-finals. I can't predict for either team yet. The chances of both winning are equal 50/50 percent.