It depends on where you're staying. A lot of bars should be showing it (like PL games) so there's no point going all the way into Lapa especially early on a weekend as it'll be dead. I'd be inclined to watch it in a beachfront bar on Ave. Avenida Atlantica or in Ipanema. Blue Agave on Vinicius de Moraes shows Scottish football games (the "Bhoys from Brasil" meet there) so there may be some footie fans in there if they're showing the Scottish final beforehand. Enjoy Fla-Flu. I hope you'll be supporting Fluminense which is my team there as they wear claret, white and green. Flamengo are more like the Man U of Brasil and their fans are just as annoying. You're probably safer in the Flu end anyway. Again I would drink in Copa or Ipanema before taking the Metro out to the stadium. No real info yet on tickets sold but will probably only be less than half full. Any other questions on Rio let me know!