That's not entirely true. Like I said, he is the AO Junior champ, so clearly he has some track record on the surface.
I tend to think surfaces as a junior don't really tell us much about how a player will develop, eg Cilic winning Roland Garros, but his game has developed since with a principle focus for really fast courts. You'd have to ask development coaches why it works like that - I always guessed it was in juniors, advantages in physical development were more important.
While it is definitely the surface he has done worst on, if one disregards grass, he also beat Kevin Kim (112) this year.
Fair enuff. Should have specified: I was using a constantly updated form database, which was more impressed with the Siriani/deChaunuc wins at the time than KK. Not much difference though.
And you have to bear in mind that he only played a couple of events on the surface, so naturally the number of wins will be lower.
True - although he's played just as few indoors, and still had some stonking good results there.