AS Roma surrendered the Serie A top spot and dropped down to fourth in the table on Sunday when they lost 1-0 at home to champions Napoli.
David Neres produced a cool finish at the end of a lightening counterattack to score the winning goal for the visitors.
Napoli are level on points with leaders AC Milan, who beat Lazio 1-0 at San Siro on Saturday.
Both sides have 28 points from 13 games.
Inter are a point further back in third after beating promoted Pisa 2-0 away.
Roma also have 27 points.
Turin giants Juventus are seventh with 23 points following a a 2-1 home win over Cagliari.
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