I know I'll catch flack for this, but I think Nadal's knees are bothering him. Usually, he has 3 kinds of bad performances: 1) Getting nervous and overspinning the ball, and thus hitting it short when his opponent is dictating play (See the Gulbis match at IW). 2) Overhitting to get out of trouble when forced to be more aggressive (many of his matches with Novak). 3) Dropping the ball too short off of both sides due to movement struggles. The over-reliance on the slice is an easy giveaway, as is the lack of action on the forehand.
To me, this match fits the 3rd description.
And before anyone drops in the obligatory "you're taking credit away from his opponent," I need to mention that Ferrer is playing very well.
EDIT: This is absolutely awful stuff from Nadal. Worst I've seen him play on clay since... maybe 2005?
EDIT 2: Please Rafa, stop going to the net. Under any circumstance.
Denisovich said:
Come on, you can't talk about the layoff anymore, that is months ago. Nadal is just playing really poorly.
Could it have to do with the knees or is that completely preposterous just because he's playing tennis again?
EDIT number 10121225: Keep in mind, arguments like "he was great at IW" don't really have much to do with this match. Yes, he played very good there, but it's kind of irrelevant.