Martina Hingis came out of therapy.
Martina Hingis . After several surgeries and long recuperations , Hingis returned to the WTA tour in 2006 , climbing to world No. 6 and winning three singles titles , and also receiving the Laureus World Sports Award for Comeback of the Year . She retired in November 2007 , following months of injuries and a positive test for a metabolite of cocaine during the 2007 Wimbledon Championships , which led to a two-year suspension from the sport . In July 2013 , Hingis came out of retirement to play the North American hard-court season , partnering Daniela Hantuchová .