I watched the match. I heard the DB Boosters yelling "go champ." I heard DB yelling come on and fist pumping pretty much any chance he had -- and I thought that was typical junior tennis, wish he'd done that less.
Now, I had never seen DB before. IMHO, he has some size, and potential. Have to give that to him. BH was very smooth, but punted (sliced) when attacked, and 90% of balls below the waist. Rally FH seemed good, Berdich like, but became very erratic when he tried to flatten it out. Serve -- no first serve to speak of, twisted everything, but it was a good twist. Overheads? Missed every single one badly (i saw three). Movement? Well, he never went foreward (ok, maybe once or twice, and on most of those occasions missed overheads). Didn't seem to me he handled low balls all that well (better with his 2H BH than FH).
Biggest issue was that he was stuck 15 feet behind the baseline, not punishing with the FH, and not closing, at all. In fact, he was backing up most of the time.
On the match score, his opponent won the first set, was down 4-1 or so in the second, came back to 5-4, was up 4-1 in the tiebreak and lost 7-4. Did I mention DB called the trainer at 5-5 deuce in that second set? He did, broke the kid's momentum rather effectively. Looked like a back or side/ab thing.
Next set the opponent was up 5-2. Opponent clutched, big time. DB got it to a tiebreak and won that 7-0. Can you take away the win. No, absolutely not. Did he win without his best game? Can't say, never seen him play before. Did his opponent get tight and fail to close. Yes, you couldn't watch that match and come to any other conclusion.
Would I watch him again, yes, probably. Did he seem to have other juniors watching and supporting him? Yes he did. I have no idea whether he'll succeed, or better yet, how to define that success. I do wish him luck.