Even if it was a boxing match, Nick wouldn't stand a chance. In some one-in-a-hundred turn of events he could win this match, but the floor wiping, I am failing to see how would that unfold tennis-wise..
He'll push Nadal for a while. Should still be o.k for first two sets but Nadal goes 2 up and could then fall away in third. Think it will be 4 sets though.
Actually Nadal could well need to get it done in straights as potential quarter and semi finals both look like they could be 3-4 hour duels when you think of his recent encounters with Theim and Medvedev in New York.
Otherwise it's possible you then get 2017 situation where Nadal arrives at the final with 4-5 hours more on the court than his opponent and that means a little bit more in your 30s.