The 22-year-old Alcaraz won 6-2, 3-6, 6-1, 6-4 to capture his second US Open crown and sixth Grand Slam title, avenging his lone defeat in a major final by Sinner at Wimbledon in July
World number one Jannik Sinner hammered Lorenzo Musetti 6–1 6–4 6–2 in the first all-Italian men's Grand Slam quarter-final
Alcaraz is 16 years Djokovic's junior but could face a tough test in his pursuit of a sixth Grand Slam title having lost five of his eight matches against the Serb
Spanish second seed Alcaraz is the only man yet to concede a set at the tournament as he goes in search of a second US Open title and sixth Grand Slam
The victory moved Djokovic into his 64th Grand Slam quarter-final, extending his all-time record, while keeping alive his pursuit of a record 25th major title
AI serves up 3D tennis and chatty commentary in US Open first
The tournament has introduced technology that transforms real matches into animated replays featuring robot-like doppelgangers of tennis stars