Napoli returned to winning ways in Serie A with a 3-1 victory away to Chievo on Sunday evening.
Senegalese defender Kalidou Koulibaly, who has been linked with Manchester United, bagged a brace while Arkadiusz Milik also netted for the visitors.
Botjan Cesar bagged a consolation for Chievo, who remain rooted to the foot of the standings.
Frosinone 1-3 Inter Milan
Inter Milan bounced back from their disappointing draw last weekend to defeat Frosnione at the Stadio Benito Stirpe.
Radja Nainggolan gave Inter the lead on 19 minutes before Ivan Perisic extended the advantage from the penalty spot in 37th minute.
Francesco Cassata pulled one back for the home side after the hour mark, but Matias Vecino sealed the win for Inter with his third goal of the season in the 93rd minute.
AC Milan 1-0 Lazio
AC Milan cemented fourth spot for another week with a slender victory over Lazio on Saturday night.
Franck Kessié got the game's only goal from the penalty spot in the 79th minute.
AS Roma 1-0 Udinese
AS Roma remain in contention for a top-four finish after defeating Udinese 1-0 at the Stadio Olimpico on Saturday evening.
Edin Dzeko's eighth league goal of the season in the 67th minute was enough to secure the spoils for the home side.
Roma remain in fifth spot, one point behind AC Milan.
Torino 1-1 Cagliari
Fiorentina 0-0 Bologna
Sampdoria 2-0 Genoa
Sassuolo 0-0 Parma