Who of the top 3 has the best/worst chance of coming back from 2 sets down?
Who has the best chance to make the comeback?
I know it has to do a lot with who the opponent is, but if each one of Federer, Nadal and Djokovic were 0-2 down, in which case would you be the most confident that the favorite will still win?
I think the one who has the worst chance is Nadal. When someone is outplaying one of the top 3 in the first 2 sets (like Seppi vs Djokovic), usually they can't deal with the pressure and the top player can still win the match by putting this pressure on the opponent and being agressive. This will cause a decline in the opponent's level after a while. Rafa is the most consistent of course, but perhaps his style is comfortable for someone who is winning. He is not putting the opponents under constant pressure, and they can take their time with the aggression and find their best game.
As for the other two, they are more aggressive. Federer is the more attacking one, but he is way less consistent than Djokovic. Between them, I definitely give Novak the edge. Since his game became more dangerous in 2011, he attacks more and takes the matches into his own hands. If you are a regular top 50 player, Djokovic is the one who you'll always need to pull something amazing against, if you want to win this last set.
If you become passive at 2-0 up, you probably won't make it against Federer either, but the ammount of UEs in his style of play can sometimes be the crucial factor in such a situation.