It could be that he's making some significant tweaks to his game and would rather have the extra time with his new coach before the masters start. There are plenty of other ATP tournaments to play.

We will see. By the way, I'm still waiting for some one to tell me when the last time was that Andy pulled out with an illness, not a sporting injuty.

Anyone...?

Well taking care of himself hasn't done much for Djokovic considering he's already pulled out of an event this year with a virus too, maybe he's a secret junk food eater.