But the atmosphere would soon turn partisan in the Juventus Stadium as Napoli secured a vital 1-0 win thanks to an 89th-minute victor from defender Kalidou Koulibaly, moving them to within one point of the leaders.
Napoli's towering centre-back nodded in a crucial header in the 90th minute on Sunday to give the Scudetto challenger an invaluable 1-0 win over Juventus.
With the loss, Juventus, who are seeking their seventh straight Serie A title, lead Maurizio Sarri's side by just one point with just four matches to play.
Napoli, who have not won the Italian title since 1990, became only the third team to win a league game away to the Turin side in over five years.
The champions now have a hard run-in to the season, including trips to Inter Milan and Roma - both fighting for Champions League places.
Napoli captain Marek Hamsik threatend twice to break the deadlock while Lorenzo Insigne had a goal disallowed for offside in the first half with substitute Piotr Zielinski's snapshot on 83 minutes cleared by goalkeeper Gianluigi Buffon.
Free-scoring Lazio thumped Sampdoria 4-0 to stay on course for next season's Champions League while Benevento were relegated after one season by Crotone's last-gasp 2-1 win at Udinese.More news: 76ers make slight change to Embiid's status
Napoli's team bus was surrounded by Juventus fans as it made its way to the Allianz Stadium, but Sarri was in no mood to be intimidated.
"We believe in ourselves, in our style of football, in our players and our staff".
"Yet another twist in the most compelling of Serie A seasons!"
The barrage of hugs was too much to handle for some Juve fans, as they burst into song in a sea of white, black and blue shirts.
Crotone are 17th with 31 points, one place outside the relegation zone, and are 14 ahead of Benevento who can not catch them. A strangely submissive, but intensely disciplined Juventus surrendered the initiative to Napoli, confident in the knowledge that even if they failed to strike on the counter, a draw would probably do the title winning business for them.
Its chances seemed to increase when key Juventus defender Giorgio Chiellini limped off in the 10th minute and was replaced by Stephan Lichtsteiner. "Chiellini, who will undergo further tests, has already started his therapy".