Defender Federico Gatti grabbed his second goal in as many matches as Juventus saw out a 1-0 home win against champions Napoli on Friday to go top of Serie A.
The centre-back rose highest shortly after the break to nod in the only goal of closely contested match between two of Italy's footballing powerhouses.
Victory in Turin sends Juventus to top spot in the table, although Inter Milan will have the chance to restore their two-point lead when they host Udinese on Saturday.
Fifth-placed Napoli had the better of the opening exchanges and looked the more likely side to break the deadlock in the first half.
Matteo Politano fizzed one just past the Juve goal early on and Khvicha Kvaratskhelia had the best early chance just before the half-hour mark.
Excellent hold-up play by Victor Osimhen sucked in the hosts' defence before he squared to his Georgian teammate, who uncharacteristically snatched at the chance and ballooned it over the bar.
Then, 11 minutes later Giovanni Di Lorenzo looked certain to open the scoring after a defensive mix-up, but Wojciech Szczesny flew off his line to make a fine one-handed save to keep things level.
The home team started the second half strongly and Dusan Vlahovic rattled the post on 49 minutes, following good play by Manuel Locatelli and Weston McKennie.
Two minutes later, Andrea Cambiaso collected a Napoli clearance and swung the ball into the box and onto the head of Gatti, whose towering header at the back post was enough to separate the sides.
It was the 25-year-old's second consecutive winning goal for Juventus, after his 94th-minute strike at Monza last Friday.
Szczesny nearly turned villain when his miskick was headed back to Osimhen who stole in ahead of the 'keeper before rolling the ball into an empty net, only to be denied by the linesman's flag with 20 minutes remaining.
Despite Napoli pressure at the end, the Old Lady held on comfortably and Gatti's third goal of the season, the most of any Serie A defender this term, remained the difference.
