Also lets not forget, Novak has evolved a lot as a player. In his earlier days he fit the mould of an aggressive baseliner. Seldom would he defensive skills be praised then (compared to now).
http://www.youtube.com/watch?v=4Dav_maKdV4
Take a look at that match. Look at how early he takes the ball, how he runs Nadal from side to side and pounds short balls that are to his FH side. Looks like a completely different player.