You know, I hate to derail the wonderful discussion we've had so far but I just realized something that I am POSITIVE will be brought up later on by .. certain fans. The tournament organizers have once again arranged the draw such that mainly Nadal - and to some extent Djokovic - are the only ones affected by the rain and interrupted match play. And they have made sure that Federer, in addition to his easy peasy lemon squeezy draw, gets the most benefit from the rain delays.
I don't even know how the rain has affected the players in question but I am certain that it is favoring Federer and against Nadal and to some extent Djokovic, and the tournament organizers have a hand in this.
Just couldn't let such an epiphany pass without commenting. Let's get back to tennis!