Martina Hingis: A Career in Pictures

A look back at the tennis career of former world No. 1 Martina Hingis of Switzerland, who made a surprise announcement Nov. 1 that she is retiring following a positive test for cocaine at Wimbledon. The 27-year-old five-time Grand Slam winner denies taking drugs, but says recent injuries as well as the prospect of fighting the doping charge led to her retirement.

AP