Denisovich said:
All this crap about Nadal 'lacking confidence', Nadals decline has nothing to do with it. It's pyhsicallity, intensity, and losing his incredible ability to focus. He cares less than he used to. That and the yips and his wta serve. So much problems in fact that I am pretty sure we won't see him win a slam again.
Nadal's decline, originally, has nothing to do with confidence. I mean if everything is fine confidence is not going to disappear on its own. It's more about the factors you mentioned. But let's think logically for a second: How can you lose physicality, intensity, ability to focus, serve, forehand, etc... and NOT lose confidence?
He played the big points terribly today. That's not always a result of him being slower or whatever. I mean, he was winning points just fine for the first two sets. Then when things got interesting, he was extremely nervous. That is a direct result in losing so much (abilities and matches), so you no longer have confidence that you're going to win these points.