I don't know, @Fiero425 (hi, btw). Daniil looks tireless right now. The longer this match goes, the better his chances of winning. This second set is super important, but Novak really has to win the next, whether for the match or to go up 2-1. If he goes down 1-2, I think he's done.
Look I am doing a half marathon run this weekend and I start well and seem at times to struggle in the middle and come home well,its about pacing yourself