Because most players are from Zagreb. And I like that a few are not from there (eg Veic: Mali Losinj, Skugor: Sibenik, Marcan: Rijeka).
BTW, now that I think of it, I've never seen a pro tennis player from Istria?
Yeah, I don't know why.
The best players form Coratia are from Split (Goran, Ancic, Pilic, Franulovic). There is one big talent again: Duje Ajdukovic, but he is just a kid.