I got a bad feeling about this match.
yes Anderson is a notorious choker but he won't be bothered at all by high balls on his backhand
his groundstrokes are very solid, his forehand is very powerful and his serve saved him against Gasquet in quite a few dangerous situations
Nadal didn't look great against Sela, in the third Sela got used to Nadal's game and deserved to win the set (but still lost it).
Yes of course if Nadal is playing well he will beat Anderson, but Nadal isn't playing well at the moment. Anderson I believe is playing his very best.
Gasquet was a (way) easier opponent for Nadal.
One shot Nadal should use a lot is his 1H backhand slice down the line, Anderson doesn't like bending to play a topspin backhand, and his touch is not great (volley skills are average too)