I'll tell you what really, on top of his own horrible performance, hurt Federer: the fact that Nadal played Dimitrov in the previous round. That's the best warmup you could ever get. I mean, Nadal practically had to play the same exact match.
I knew since 2009 AO Fed would never beat Nad again in a slam, boycotted Fedal since '10. Got tricked by Edberg my favourite player as "coach" into violating my own principle. Never again. Both things.