At 3th week Portuguese football league Benfica and Porto will play the first big game of season.
Benfica leads with 6 points and Porto start the season very weak and is in 6th with 3 points.
Benfica plays at home and is in advantage for all reasons, for Porto this is, I guess, the game of "all or nothing", if Porto loose will be 6 points below Benfica, at 3th week is not a good start and many things can happen in Porto if they don't score at Benfica's home.