Juventus, emulating their feat of 1935 when the Turin giants won a fifth straight title for the first time, had gone 12 points clear of Napoli with a 2-1 win at Fiorentina on Sunday when goalkeeper Gianluigi Buffon made a last-gasp penalty save from Nikola Kalinic.
Napoli had to beat Roma to have any chance of maintaining their bid for a first title in 26 years, but Maurizio Sarri's men were stunned when Radja Nainggolan hit an 89th-minute winner for the hosts at the Stadio Olimpico.
While Roma celebrated their victory, the big party was going on in Turin, where thousands of fans watched the Napoli game on big screens in anticipation of their side's title triumph.
There were also jubilant scenes at Juve's Vinovo training ground, where the Turin giants celebrated the result in Rome with a giant bottle of champagne.
Defender Leonardo Bonucci was seen soaking fans waiting at the gates of Vinovo with champagne.
hard times. Looking at our season, it makes me even more proud," said Allegri, who steered Juventus to their first league and Cup double in 20 years in his first season in charge last year, as well as a first Champions League final appearance in 12 years.
- Higuain thwarted -
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In what appeared to be a reference to Juve's struggles at the start of the season, when they took only one win from their opening six games, he added: "Serie A isn't the final of the 100 metres, but a marathon. You need patience to find the right rhythm."
Argentine striker Gonzalo Higuain, with 30 goals so far this season, made his return from a three-match ban handed out after a dramatic meltdown at Udinese three weeks ago when the visitors lost 3-1 to see their title hopes all but vanish.
But in summer-like weather, Roma's bid to qualify automatically for next season's Champions League inspired the hosts to a solid display in which Higuain was given few chances to increase his impressive goals tally.
The Argentina international had three shots on goal, but was thwarted on each occasion by Roma 'keeper Wojciech Szczesny.
Overall, it was a bitter outing for Sarri's men, who are now only two points ahead of Roma with three games remaining.
