Tennis World has some quotes from Rafa's presser. He said he doesn't have an injury, it was just something with the toenail- but did not affect the outcome of the match.
Nadal press conference quotes:
Q. You seemed to have trouble finding your game most the day, and you appeared to have an injury. Give us an overview of what heppened.
RAFAEL NADAL: No, sir, no. No injury. I didn't feel well playing tennis. I had more mistakes than usually. Well, I feel a little bit tired from the last two matches. That's sure. Because, well, in the runs I feel a little bit more slowly than days before.
Well, if you play against one player like Novak you have to play 100% if I want to have chances to win.
Q. What did you take the medical timeout for? What was happening with your foot?
RAFAEL NADAL: Yeah, I was - I don't know exactly, no? But very tough in English for me. I improve but not a lot.
MODERATOR: Just next to the nail, next to the toenail. It was just, you know, bothering me. It was hitting - every time I was pushing near the toenail.
RAFAEL NADAL: I'm not saying that this affect the match. It's not an excuse.