It's notable that Murray's the one hampered by a day less recovery - a reversal of the US Open. I suspect that this will be one of the deciding factors tomorrow, with Djokovic emerging victorious after Murray runs out of steam.
Third set in Shanghai, oddly enough.
Murray was suffering from the effects of a virus then, so I can see no reason why he can't recover from the Fed match given the fairly easy run he had to get that far.
Nightmare will be a long 5 weeks without Andy
It mght only be 4 if he plays at Delray Beach, which I think he will since I can't see him wanting to go straight into a Masters 'cold'.