They may be separated by just one point with 30 games remaining of the Liga NOS season, but you'll have a tough job explaining to anyone connected with FC Porto and Benfica that tomorrow's clássico will not be bristling with the burning intensity this fixture has come to embody in recent years.
The latest meeting between the two sides that have dominated the Portuguese championship over the past decade will be particularly testing for three men: the two coaches and Porto right-back Maxi Pereira, who controversially swapped the Red shirt for the Blue and White stripes after almost a decade of outstanding service at Benfica.
The match is a sell-out, as one would expect. Victory for either side could have a significant effect on the rest of the Liga title race, even coming at this nascent phase of the season.