Nadal is in no way a bad matchup for Novak, quite the opposite. Of course he's an issue for everybody on clay regardless of matchup but his superior H2H stats are a reflection of his qualities as a player in SPITE of the match up issue.
Haha try again. Novak is a better player and only lost so many times to Nadal before he hit his peak. Of Novak hit 2011 form before Dull would have no chance. But don't worry, Dull gets Wristovic in the Rome final
Look at stats. Nadal only beats Novak when he plays terrible tennis, on any surface but especially HC in which he doesn't need to be anywhere his best to beat peak Dull on that surface.