Why are there so many Serbs & Croatians in tennis?

i noticed every second player's name in the Aussie Open ended in "ic":

Djokovic, Jankovic, Ivanovic, Dokic, Ancic, Cilic, Delic, Ljubicic, Tipsarevic

how come the Balkan countries are cranking out so many top seeds?
Update: Bombing? lol

uhhh there hasn't been any major conflict in Europe since the Yugoslav wars and that was in 1991
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