No poll, since there are many players whose defenses are great.
I would say that A. Radwanska defends a bit better than Errani, and Errani a bit better than Wozniacki. But, again, there some really good defenders more.
It would be nice if you could make a 'little rank' at least for the first places!
Some posts here saying that Azarenka is not a good defender or not as good as Radwanska and some other players are really funny. For me defence is not all about returning as many balls as possible (I am not denying that Aga can't do that), but also turning it into offensive and taking the opponent's advantage. So the best in my opinion are Serena and Vika.
Wozniacki, Radwanska and maybe Errani are something else in my book which also includes JJ and Andrea Petko.
When I saw the thread title, I thought... "Let's see when Serena is first mentioned here"... And there she is, in post #3.
Magdalena Maleeva's last words at her send-off:
"There is a saying that there is no friendship in tennis, but I've proven the opposite. After all of them are here, it means that there is friendship and I want to thank them for being here tonight. I hope the fans are happy too."
My blog about my semester spent in China (bilingual in both German and English): http://crazillo.jimdo.com! Please feel free to make comments!!