Hmm.... I've just seen the match between Nole and Sinner. Ended fairly routine for Novak but it was a battle at times. However, Nole was solid in his 1st clay match this season (kept the opponent deep behind the baseline, also did the damage with drop shots). Sinner is already a strong player but maybe not on his favorite surface today (was too nervy ......probably wanted to display his A-game versus world number 1). we can say he burned with desire.
I just checked the scores, 6-4 6-2 so it is a dominating win by Djokovic.
I agree that most of the times, this young players are nervous just to see Djokovic in the others side, so there's this so called intimidation factor. Probably Sinner is more suited for fast surface, but there are a lot of players that is also good.
Nadal against Delbonis, Rafa leading the game. Hurkacz lost the first set again Evans, this is going to be an interesting match to watch if Hurkacz can come back and win the match.