Defending champion Radwanska returns to site of biggest win

World No. 3 Agnieszka Radwanska will be a favorite in Singapore, most of all because she has won there before. The crafty 28-year-old's highlights this year include titles in Shenzhen, New Haven and Beijing. She also reached the semifinals of the Australian Open.

Though Radwanska hasn't won a Grand Slam (yet), she's a threat to win any tournament she enters, and has become famous for her hot shot abilities (earning herself the nickname "The Magician").

Last year, the Pole took home the biggest title in her career by beating Petra Kvitova in the final.

Can she defend her title this year? She's competing in the round-robin draw with Karolina Pliskova, Garbine Muguruza and Svetlana Kuznetsova.