Although there's still Djoker in between those two.
I mean, although Murray has a favourable h2h against Delpo, all their matches has been close and I'm just convinced Delpo has the game and what it takes to defeat Murray. Thing is Delpo is right now the quickest growing talent this year, while something similar could be said about Murray last year. Murray seems to have found a ceiling to his game, if he wants to improve he will have to be more aggressive and not just be a pusher.
Delpo, on the other hand, hasn't reached his ceiling and has a lot of room to improve. One of the greatest things about this guy is that he is COACHABLE (unlike Safin, a headcase. A lot of people are saying Delpo is Safin + Mental Strength).
By that I mean he really wants to keep learning and growing. When he won the USO he said: "I have 2 dreams, one I did it, which was winning this grand slam, the other one is much difficult, it's to be like you, Roger" something like that.
I think that says much about his hunger for glory and his admiration and humbleness. So imagine if he really keeps up honing his talent. He might as well become the future of tennis after the Fedal domination.
And then there is Novak Djokovic. He has a very complete game, except some lags when going up the net. He won a Slam in the middle of the Federer-Nadal domination but ever since hasn't reached another slam final.
My explanation: He lost a bit of focus on the game to become more of an entretainer. He seems like a nice guy sure, but sometimes when he loses a match it seems like he's happy of losing. Of course he isn't but it doesn't seem to upset him so much as it might to other of the top ranked players. He seems to think much more for the crowd.
This is a very dangerous guy, if he proposes it, he has a deadly game. But he isn't the mentally strongest of the three. That's Delpo, and that's how he won the last slam: mentally