David had 5 match points at what really ended up being the middle of the 2nd set. Because Nadal saved them, they played 4 more games and a TB, which Nadal won. Here's their history up until that match: they had played 2 matches, and Nalbandian had made short work of Nadal in both. Nadal has since admitted to being nervous before that match, and not sure of what his game plan was. He'd never broken Nalbandian. But, with his back totally against the wall, (as you pointed out) #1 Nadal rose to the occasion, fought off MPs on his own serve, then did what he hadn't yet done, which was to break Nalbandian's serve in the next game, then they both held to force the TB, which Nadal won (5). He subsequently broke Nalbandian in every one of his service games in the 3rd, and also beat Nalbandian in the next 3 matches that they played, to finish with a 5-2 H2H when Nalby retired. Sure, Nalbandian was great for a set and a half in that match, and sure, with a bit of luck, he'd have won that one. But he didn't, so you can't make overmuch of Nalbandian outdoors based on a match he didn't win. It doesn't work that way.