Youngest brother Djordje played the 18s Eddie Herr last month and got a wildcard but lost in the first round to another wildcard, 2-6 0-1 (ret). That does not indicate he is a special player at all. With curiosity I asked a Serbian journalist at key Biscyane earlier this year about the younger Djok brothers and he said it's a myth that they are better than Novak, they are "nothing special" were his exact words.
"He looked like he was trying to imitate Sampras when I first played him." Agassi in Facing Federer