That's what many people thought during AO 2019, but we know the end result.
To derive from two results (Nadal d. Medvedev in Montreal and Medvedev d. Djoker in Cincinnati) that Nadal is as good or even better than Djoker on HC is a terrible mistake. You don't take into account the
matchup, that Medvedev can torment Djoker while he played with Nadal only once and
wasn't prepared for Nadal's style of play. Furthermore, nervousness from the Masters final aggravated Med's performance, while he was mentally relaxed against Djoker in SF Cinci.
Djoker is the world No. 1 and defending champion at USO. There's no bigger favorite for the title than he.