I think Rafa of the first set against Edmund is good enough to beat Zverev. Hopefully he can maintain it, but I have my doubts. Zverev is a better player than Edmund and is also clutch. I think Alex takes it in 3.
Have some faith in our RAFA, brother
HC at AO allowed Zverev to ballbash and the courts helped him to. Zverev isn't mentally strong enough to play proper clay court tennis IMO which requires point construction and good defense. RAFA isn't the same but Zverev will be nervous as well facing the best ever on the surface so early.