Oh come on, the boy had just won his first match at the US Open. He was excited and probably not thinking straight, is it so wrong to forget a little fact? It's not like he was saying he was the only Bosnian ever to accomplish something in tennis.
It's doubtful that he meant anything by it, it probably just slipped his mind.
Besides, I think these days the US is more 'his country.' *shrugs*
David Ferrer , David Nalbandian, Nicolas Almagro, Feliciano Lopez, and Juan Monaco