Alcaraz will end the year top of the rankings for the second time, having become the first teenager to achieve that feat in 2022.
In addition to his tour-leading 70 wins, Alcaraz has also achieved an unmatched eight titles in 2025 – including two Grand Slams – equal to his total number of losses.
Now he will seek to complete another stunning season by winning the ATP Finals for the first time.
Musetti was backed by a passionate home support inside a packed 12,000-capacity Inalpi Arena, as he sought to build on the momentum of his dramatic victory over De Minaur on Tuesday.
The Italian, battling fatigue in his seventh match in nine days following his run to the Athens Open final, matched Alcaraz deep into the opening set – but his admirable resistance was eventually ended in an absorbing 11-minute 10th game.
Although Musetti continued to dig in, withstanding a break point in his opening service game of set two, his relentless opponent continued to apply pressure and broke to love for a 3-1 lead.
That sparked Alcaraz’s dash to the finish line, but only after a free-hitting Musetti created his first two break points to re-energise the crowd.
That excitement was short-lived as Alcaraz fired back with four consecutive points, and there would be no recovery for a fading Musetti, who was broken again before Alcaraz served out victory to achieve the first of his goals in northern Italy.
