As if losing wasn't bad enough .... Hingis' feet now hurt. Best idea: "The Shoe That Turned Martina Hingis' Feet Into ... But it took a good long time, and after all, in any endorsement deal ...

Martina Hingis has announced her retirement on Facebook. The 37-year-old's final tournament will be the WTA Finals in Singapore, where she and Yung-jan Chan are the top seeds. The duo won their ...