Twenty minutes later, Neymar was at the receiving end of Cavani’s work to wrap a near-perfect debut.
PSG are second on six points, behind Olympique Lyonnais on goals scored with Monaco, who thrashed Dijon 4-1 away earlier on Sunday, in third place also on six points.
Despite Monaco fans’ concerns that French prodigy Kylian Mbappe might be leaving, they know they can still trust Radamel Falcao after the Colombian striker hit a treble.
France international Mbappe was left on the bench amid speculation that he wants to join PSG but he was not needed as Monaco equalled the record of 14 consecutive wins in the French league.
Falcao scored twice before the break and once after to take his tally to four goals in two games while Jemerson netted another.
Earlier, Lille were beaten 3-0 at promoted RC Strasbourg, conceding all three goals after striker Nicolas de Preville took over as goalkeeper following the sending off of Mike Maignan in the 63rd minute.