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 ...

Martina Hingis never had a big serve, a lot of power or even a lot of speed. But for the brief time she ruled the game, the Swiss star used angles better than anyone. When I teach, I identify ...