The two scheduled season-opening matches had been pushed back because of Atalanta and Inter's European campaigns in August.
And the two northern rivals gave a demonstration of their firepower which they hope will deny Juventus a 10th consecutive Serie A title, with the champion settling for a point at Roma on Monday (AEST).
These players are growing from a technical point of view. The technique is endless, but we will never stop trying to improve ourselves. We made the best leap in this respect and the quality of the goals
Atalanta and Inter are now both top of the Serie A table alongside Napoli, Hellas Verona and AC Milan with a maximum of six points from two games.