Arkadiusz Milik and Dries Mertens were among the scorers as Napoli thrashed Roma 4-1 at the Stadio Olimpico.
Milik put the visitors ahead with a delightful second-minute effort, his 16th Serie A goal of the season.
Roma levelled in first-half stoppage time through Diego Perotti’s penalty, before Mertens put Napoli back in front four minutes after the break.
Simone Verdi made it 3-1 five minutes later and substitute Amin Younes added a fourth with nine minutes of normal time remaining.
The result sees the gap between Carlo Ancelotti’s second-placed Napoli and leaders Juventus go back to 15 points.
Roma – for whom it was a second successive defeat in their third match since re-appointing Claudio Ranieri as boss – had slipped a place to sixth in the table ahead of kick-off due to Atalanta winning at Parma earlier on Sunday.