The victory at Stadio Carlo Castellani left Inter on 15 points after five games, three ahead of second-placed rivals AC Milan, who beat Hellas Verona on Saturday. Empoli remain rooted to the bottom of the table with no points and no goals.
Inter dominated a goalless first half before scoring the opener in the 51st minute when a clearance from a corner fell to Dimarco, whose spectacular volley arrowed into the top corner.
Empoli offered some resistance after going behind and Filippo Ranocchia's free-kick forced a sharp save from keeper Yann Sommer, but Inter held on to win and maintain their 100% league record.
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