Isnt this obvious. I bet on Fluminense to win because the odds are huge. The bookmakers will be proud of me right now I know lol 
By the way, the game is on and Chelsea has taking the spotlight. The first 15 minutes they are pressing, I was scared at some point they would have scored, before I could writ this, Chelsea just scored.
I think after that goal Fluminense stepped up, from the beginning of the match their plan was to sit back and counter attack, they when they get their goal they will sit back and defend just the way they did against it inter Milan. It not going well as they have conceded a goal already.By the way, the game is on and Chelsea has taking the spotlight. The first 15 minutes they are pressing, I was scared at some point they would have scored, before I could writ this, Chelsea just scored.
I knew it will be a very difficult match for them because Chelsea are in a good scoring foam in this tournament, though even after taking the lead I can still say the match is far from over, maybe when Chelsea scored another goal to make us 2-0 then maybe, just maybe they will be in total control.
As for your bet, I cannot say it over because this is football and anything can still happen, but your chance of winning is very slim.