Heading into the last round of the Serie A season, Napoli held a one-point lead over title rivals Inter Milan, meaning a win for them, or simply matching Inter's result, would secure the title for Antonio Conte's side.
And that's precisely what happened on Friday with Napoli beating Cagliari 2-0 thanks to goals from Romelu Lukaku and Scott McTominay, while Inter brushed Como aside 2-0 concurrently.
Interestingly, had the two sides finished level on points, they would have needed a playoff to determine the title.
Read a full match report from Napoli's win here.
Napoli's victory was their 24th of the season. They haven't been the biggest scorers in the league, but Conte's men have maintained a mean defence, losing only four times and conceding just 27 goals in the 38 rounds played.
Inter, meanwhile, were neck-and-neck with Napoli for so long until a pair of losses in late April (to Bologna and Roma) handed Napoli the advantage.
Despite a couple of wobbles, drawing with both Bologna and Genoa, Conte's men have largely been unstoppable in the league this year, losing only once in 2024 - away at Como in February.
It is just the fourth time in history that the club have won the Serie A title. They claimed it twice in the 1980s, driven by the magic of Diego Maradona, and two seasons ago under the management of Luciano Spalletti.
Conte's success is remarkable for the fact that this is just his first season at the helm of the Partenopei. Previously, he has won Serie A as a manager on four other occasions, three times with Juventus and once with Inter, but this title is arguably his greatest of those achievements. He has now become the first-ever coach to win Serie A with three sides.
"It's happened again and it's fantastic... we've had a really great season and it's all thanks to the boys who wanted to put themselves out there, especially those who won the league two years ago," said coach Antonio Conte.
Not only did Napoli have to reshape their attack this season after loaning out striker Victor Osimhen, but they also sold star winger Khvicha Kvaratskhelia to PSG during the January transfer window.
In the absence of those two previously talismanic players, new stars have emerged in Naples. Most notably, Romelu Lukaku, who has led the line with 14 goals this season and former Manchester United midfielder Scott McTominay, who has been a man reborn in Italy, contributing with 12 goals and stealing hearts and headlines throughout the season.
Fittingly, both scored on Friday, with McTominay later named Serie A's player of the season.
"I'm lost for words. It's incredible you know, the sacrifice that every single player in the group has put forward to the cause," said McTominay.
"And the people deserve it because they've been behind us from day one, and for me to come and experience this is a dream."
Other standout players have been their lynchpin pivot, Stanislav Lobotka, and the trusted Italian guard of Giovanni Di Lorenzo, Matteo Politano, and Giacomo Raspadori.