New Delhi:Former world number one player Martina Hingis announced her retirement from professional tennis for the second time.
Announcing her retirement, the five-time Grand Slam champion admitted she was undergoing investigation for a positive cocaine test at this year's Wimbledon tournament.
"I have tested positive for cocaine but I have never taken drugs," the 27-year-old said on Thursday. "I have made this public to avoid a fight with anti-doping authorities."
The Swiss Miss has also won nine Grand Slam women's titles during her career.
She explained that her retirement is because of her age and persistent health problems.
Hingis first retired in 2003, but then had a dream comeback to win three more titles and finish the year ranked seventh in the world.