There is something in the Croatian water that causes many of their tennis players to have great serves.
Most famously, Goran Ivanisevic is one of the best servers in tennis history, and judging by all the ace records that he holds, he may be the best one. Ivo Karlovic isn't too far behind.
This extends to the women's side with Ajla Tomljanovic, Donna Vekic, Ana Konjuh, and Mirjana Lucic-Baroni. So my question is what is the reason(s) for this? Obviously, height does help and many of these players are quite tall, but is the serve also a point of emphasis in Croatian tennis development? Or is it all a coincidence?
Out of the four women's players mentioned (or someone else), who do you think has the best serve? They're all pretty good.