Djokovic looked tired and the foot work was not good at all.
That being said, he had some fantastic placement on his serves on many big points. It would have been worse if he had not been so precise with his location. The kid definitely needs to improve his service placement. At this time Alcaraz is a superior athlete. But Djokovic has been through so many big long tedious books I think he can beat him. Djokovic is still good enough to rely on his experience to win.... the kid is an athlete with great hand eye skills. And the Harlem Globetrotter skills can also be what can beat him... going for great shots instead of the mundane shots that lead to easy put aways next shot.
If the kid just learns to play a bit steadier he is going to be to beat. Especially if he can get that serve right instead of just crushing it. A service winner is as good as an ace. Placement Carlos... Watch the tape.