The Uruguayan footballer Edinson Cavani followed his hat-trick against Lazio by converting a second-half penalty against Sampdoria to give Napoli a 1-0 win to keep them top equal with Juventus in Italy's Serie A.
Both teams have 16 points from six games while Uruguay forward Cavani took his tally to six goals.
Fabrizio Miccoli scored a hat-trick to give Palermo their first win of the season, 4-1 against Chievo.
Cagliari, beaten 2-1 at home by Pescara, are the only remaining winless team.
Torino scored four goals in a quarter of an hour during the second half to win 5-1 at Atalanta and Bologna thrashed Catania 4-0 in another one-sided game.