All I will say is this:-
1. Rublev hit 34 errors in 5 sets against Rune. That is amazing for someone so ballbashingly one-dimensional, and he will need to repeat that trick in the next round, though he is unlikely to get 60 from his opponent next time to help him out.
2. The most amazing thing about Rublev in that match was how calm he remained the whole time. Hardly any screaming, no self-mutilation. To go through 5 dramatic up-and-down sets like that and stay as composed as he did is very un-Rublev.
Both those things will serve him well in his next round if he can maintain them. The thing I'm not sure he has an answer to is that he'll surely be brought to net plenty to get him out of his rhythm, and even against Rune he was only 18/28, which is not great.