I just texted someone that Zverev couldn't have asked for a more favorable path at Roland Garros, and now with Sinner not playing at his best (a high bar, to be fair), Zverev may never have a better opportunity to win back-to-back slams. Yes, it's absolutely a mental switch that's been flipped, and you can see that the physical ingredients were there all along. Pressure and expectations can cripple even the most talented of athletes
Djokovic, probably for years now, has done what no youth coach would ever teach, and picks his spots in tightly contested matches. You can do that when you've truly mastered your craft and are the GOAT. I expect him to be going all in on Sinner's serve early. Djokovic knows what his last match does to a 39-year-old body vs. a 24, and knows that Sinner knows that too. As usual (personally I'm over it), I predict the pressure will, somehow, be on the much-younger Sinner in the first few sets