Reports where saying it was supposed to be dry but overcast... If its dry the merc will be off in to the distance; think they'll run red boots to give them initial sprint and grip and then use their speed advantage to get a 1-2... if wet then its all open... Lewis would be favourite but Max will be up there, especially at the start... but then if its too wet they start behind the safety car in which case then it will probably be a lewis/max 1-2 barring any technical failures.
Say if Merc run red shoes, can RBR also running red shoes, change at last minute? I gather it will be cooler than hotter, so Merc rules, and that's ok. The race behind Merc is a good watch this year. I.e. award Merc the Constructors then ignore them so we can watch the rest :-)