murray cannot dominate on all surfaces - similar to federer
they can eat GOAT cheese, though.
I'm going to wander out on a limb and say Muzzah will win his first clay masters next year, probably in Madrid. I think/hope he'll also win a slam, but Murray's been rapidly improving his clay game and if Djokovic/Nadal by some twist of rankings fate end up on the same side of the draw, I think he has a good chance. Muzzah has never felt the pressure to perform in Masters that he has in slams so I feel that makes it more likely.