Don't mind MasterTS, all he ever does is bash Federer.
I think that Federer technically should win this match. Nadal's strokes will not bounce as high on him, which is what gives him the most trouble with Nadal (especially on the backhand side), and it should be easier for him to hit winners, also to his advantage. Federer has nothing to gain, and everything to lose. Nadal has nothing to lose, and everything to gain. The pressure could be a huge mental burden and this match reaks the possibility of an upset.