The 2021 Davis Cup runner-up is top seed for 2022.
Retiring world No. 1 Ash Barty praises potential successor Iga Swiatek as worthy one.
The American believes she can join the elite at the top of the rankings.
Iga Swiatek will likely be the WTA's new No.1 on April 4, but it isn't a lock just yet.
Seeded third in Miami, Stefanos Tsitsipas is playing for his first title of the season.
"The MRI was really positive or else I wouldn't be here," Taylor Fritz said of the state of his creaky ankle ahead of the Miami Open.
"I always looked up to Ash. I still do," said world No. 2.
