No one of them...they are using the midplus.
About the mid users....i think haase, de bakker, schuettler...and in the past years safin monfils and dimitrov...
Nadal has impressive volleying skills.
BUT.
He goes to the net 5 times each match.
Even if he hits 5 winners, i can't consider him a volleyer...
he hit the volley when the point is already finished, he doesn't build it up at the net...
We should consider the number of times a player visit the net...
If nadal plays 4 good volleys over 5 is not a better volleyer than someone who hits 30 volley winners over 50 approaches...
Let me understand...
are we talking about HARD HITTING or about single HARD STROKES?
DELPO,SOD and BERDYCH are IMHO the hardest hitters out there...
On the other hand...even djokovic hits some bombs...