A R1 match is a sure guide to his title prospects.
The aim is to survive week 1 at this point, for all the top players. No banana skins. Even with Murray not playing great, he was done in just over 2 hours, with the loss of just 7 games.
If he's still playing like this after 2 more rounds, then I'll start to worry. This is about as meaningful to title prospects as Roger's hugely memorable R1 performance at Wimbledon - which I bet most of you would need to look up to see who he beat and how.