Fluminense,San Paulo,Flamengo,Atletiko Mineiro,Internacionale was good but now they play in Brazil B Series,a lot of good players playing in Brazil,Alexandro Pato,Luis Fabiano,Fred!
São Paulo is the best team in Brazil without doubts. Three-time world champion. One of the few teams that did not fall for the B series. Time giant does not fall!
I know many brasilian teams but the sad thing is (for them) that if a player gets good, he go to Europe in big teams.
I remember Corinthians defeated Chelsea a few years ago and won the Club World Cup. That was a great job!