The Austrian will make his first appearance since defeating Roger Federer in the 2019 final.
The Spanish legend says that despite his mind-blowing success, Alcaraz has much to work on as a new season begins.
There were not changes inside the WTA's Top-10, but plenty of movement elsewhere.
Wu Yibing is this week's biggeset rankings riser, while Djokovic begins his 376th week at No.1.
Continuing his recovery from a left hip injury, Rafael Nadal won't be playing Doha or Dubai.
In a joint statement the tours announced a new initiative on Tuesday.
The Americans were added to a field that includes Frances Tiafoe, JJ Wolf, John Isner and 2019 cham Cristian Garin.
