Edinson Cavani scored the decisive goal for Napoli in the 68th minute of Sunday's clash after Marek Hamsik was brought down by Daniele Gastaldello in the Sampdoria box, resulting in a penalty.

Gastaldello was sent off for receiving a second caution and had barely left the pitch as Cavani fired the ball past Sampdoria goalkeeper Sergio Romero, who had little chance of making a save.

Like Juventus, Napoli have five wins and a draw after six games, though Antonio Conte's side remain on top with a superior goal difference.

Inter moved up to third place on the table following a 2-1 victory over Fiorentina at the Stadio Giuseppe Meazza.

Diego Milito opening the scoring from the penalty spot in the 17th minute before Antonio Cassano doubled the hosts' advantage 15 minutes later.

Romulo pulled a goal back just before half time, but Fiorentina's hopes of salvaging anything from the match were effectively dashed when Gonzalo Rodriguez was sent off following his second yellow card in the 62nd minute.

Elsewhere, Ederson and Cristian Ledesma got on the scoresheet as Lazio clinched a 2-1 victory at the Stadio Olimpico.

The win saw Lazio climb to fourth with 12 points, while Sampdoria dropped to fifth on 10 points.

Fabrizio Miccoli netted a hat-trick as Palermo recorded their first win of the season by beating Chievo 4-1 at home.

Cagliari remain rooted to the bottom of the table without a victory after going down to Pescara 2-1 at home.

Meanwhile, Bologna accounted for Catania 4-0 at home, Torino thumped Atalanta 5-1 away and Udinese and Genoa played out a 0-0 stalemate in Udine.