Jorginho ensured Napoli maintained their Serie A title challenge.
Napoli returned to the top of Serie A following a narrow 1-0 win at Udinese.
They had been overtaken by Inter Milan after the Nerazzuri's 3-1 victory over Cagliari on Saturday evening.
The only goal came in the 33rd minute when a bewildered Gabrielle Angella brought down Christian Maggio in the box and though Jorginho's penalty was saved by Simone Scuffet, the midfielder tucked away the loose ball.
That was enough to keep Maurizio Sarri's side unbeaten for a 14th game and return them to the summit, two points clear of Inter.
Roma moved fourth and ahead of rivals Lazio thanks to a 1-1 draw at Genoa.
Stephan El Sharaawy had Roma ahead in the 59th minute but 10 minutes later they were reduced to 10 men.
Daniele De Rossi tangled with Gianluca Lapadula in the penalty area and was dismissed for violent conduct, before Lapadula scored from the resulting penalty to bring Genoa level.
AC Milan's hopes of remaining in contention at the top of the table took another blow as Torino held them to a goalless draw at the San Siro.
Milan have only won two of their last eight games and now sit seventh, six points behind Sampdoria in sixth, and 11 behind fourth-placed Roma.
Information from the Press Association was used in this report.
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Source: espn.co.uk