Just followed the last page of this thread.
When the commentators described Nadal's predicament of having so many matches to play, compared to Federer being farther ahead in the draw, the whole thing struck me as curious.
Here all these players are racing onto the court, trying to get their matches in, and Nadal is on the third day of playing the same match.
Then I had this notion, "You know, Nadal's slow-play style of delay-delay-delay is being punished here."
You could send out for iced tea and finish half of it before Nadal is good and ready to play each point.
So maybe this kind of predicament had to happen sooner or later, given his style of play.