The Serbian had a round game since the return and took full advantage of the licenses of a Berrettini who erred much with his right and could never get in the game.
Triumph number 36 for Djokovic in his history in the contest, placing himself as the third most winning with his excoach Boris Becker. Still ahead: Roger Federer (57) and Ivan Lendl (39).
The Serbian pursues his sixth title in the tournament, to match Federer's record, which this Sunday, for the same group, will open fire on Dominic Thiem.
Nole also seeks to recover the No. 1 in the world, hand in hand with a Rafael Nadal who gets entangled in physical unknowns (he got off in Paris semis days ago and had previously had to retire from the Laver Cup).
What does Djokovic need to get back to the top? At the very least, reach the final. But if Nadal wins two Serbian matches, it will only help him to be champion.