Substitute Simone Zaza scored two minutes from time and Juventus beat visiting Napoli 1-0 on Saturday to take the Serie A lead from the southern club.
Seeking its fifth consecutive title, Juventus moved one point ahead of Napoli with 13 rounds remaining in the Italian league.
Near the end of a match in Turin that had been characterized by few chances for either side, Zaza's goal came with a long, curving shot that deflected slightly off defender Raul Albiol.
It was Juventus' 15th straight win, moving the Bianconeri within two victories of the Serie A record established by Inter Milan in 2006-07.
Earlier, Daniel Ciofani scored twice as promoted Frosinone beat Empoli 2-1 for its first away win in the top division. Also, Chievo Verona and Sassuolo drew 1-1.