With the game 40 minutes old the confidence ebbed away.
The Belgians "score" a goal, the bar falls silent.
But it is disallowed for an apparent push - a controversial decision which leaves even these fanatical fans looking a little embarrassed.
As the second half progresses, and Belgium begin to take control, the atmosphere becomes more funeral than carnival.
But then comes the moment when it all explodes into life.
Rivaldo turns and shoots on the edge of the area. Goooooal!
"Brazil, Brazil, Brazil!" - the place is jumping, and the fists banging a rhythm on the tables that, while not quite samba, still has everyone on their feet dancing.
Bring on England
A late second goal by golden boy Ronaldo - greeted with even more joy than the first - and Brazil are through.
Now for England.
Junior llmeiea is still confident: "Brazil have a good chance, but it will be very close, whoever wins it will win the World Cup and I think it will be Brazil, 3-2."
Luana Rosa, even more than the other Brazilians in the bar who have made England their home, has reason to look forward to the match.
Shirt swapping
Her father is Brazilian, but her mother English - however there is no question where her heart lies.
"Oh it's Brazil, it is always Brazil - not even slightly England.
"They play much more exciting football, and anyway, if you could chose a team who has won the World Cup four times or one that has won it once, who would you pick?"
England will be hoping it is not five-one by the end of next week.