Napoli are one step closer to claiming their first Serie A title in 33 years after a 2-1 win over Lecce gave them a 19-point lead over second-placed Lazio.
A Giovanni di Lorenzo header opened the scoring for Napoli before Federico di Francesco equalised after the break.
But Napoli found an own-goal winner when defender Antonino Gallo chested the ball and saw it slip through goalkeeper Wladimiro Falcone's hands.
The visitors held on to bounce back from Sunday's 4-0 loss to AC Milan.
Elsewhere on Friday, Inter Milan's Romelu Lukaku missed a series of chances as Simone Inzaghi's side settled for a 1-1 draw after a 90th-minute Salernitana equaliser.
AC Milan, who were held to a goalless draw by Empoli, stay one point above their city rivals in third place.
Lazio host seventh-place Juventus on Saturday.
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