Of course he's feeling the pressure
It's tough when everybody expects you to do well and break some record. Even the coolest ones feel the burden of expectation
I don't expect Andy Murray to be any GOAT. I'll say it's a big achievement if he can win one GS, with the stupid British hype going round and round
Now his closest-aged peers Nole and JMDP both have a slam and he just got beaten by a younger Marin, it'd be a lie to say he does not feel stressed. I foresee a dip of performance in the coming 6 months for Murray, but he should be mature enough to figure it out later.