Experts' picks: Outside Djokovic, our eyes are on Medvedev, Barty and Osaka

Novak Djokovic is the favorite, but who else could make a run? And can Ash Barty win back-to-back Slam titles?

source https://www.espn.com/tennis/story/_/id/32096639/us-open-2021-experts-picks-djokovic-our-eyes-medvedev-barty-osaka