Today's Geo Quiz sends us to the home-town of the world's top woman tennis player. Now, if you're thinking, Saginaw, Michigan -- after all, that's where Serena Williams was born -- I'm afraid that's not it.

Jelena Jankovic

Serena Williams was number one. But she made way in the rankings today for Jelena Jankovic. And the current tennis queen hails from a city in southeastern Europe. It's the capital of Serbian culture, education, and science. And it's on the Danube River. In fact, it's the second biggest city on the river behind only Budapest in population.

Jelena Jankovic

So we're looking for the hometown of the world's top woman tennis player, Jelena Jankovic, who plays right handed with a two-handed backhand. The ball's in your court.