This is not good. Roger Federer absolutely blitzed Rafael Nadal 6-3 6-0 in the round-robin stages of the ATP World Tour Finals. This is Rafa's worst loss to Roger in their rivalry. Nadal was not at his best (he was pushed to the absolute brink in his previous match against Mardy Fish because of a stomach problem that forced him to take a bathroom break in the 3rd set) but it's still unfortunate that he got routed this badly. I guess if there was anyone he would lose to this badly, it may as well have been to Federer (I would surely have been more painful if Rafa got whitewashed by Novak Djokovic).
Rafa has never really fared all that well in the ATP World Tour Championships (apart from last year when he challenged Roger in the final) because the surface doesn't favor him and I guess this year is no different. Hopefully, Rafa can shake of the bad vibes (which have been mainly due to his losses to Novak) and get back on the winning track in 2012.