Martina Hingis is a Swiss professional tennis player who spent a total of 209 weeks as world no. 1. She won five Grand Slam singles titles. She also won nine Grand Slam women's doubles titles, winning a calendar-year doubles Grand Slam in 1998, and one Grand Slam mixed doubles title.
Hingis set a series of "youngest-ever" records before ligament injuries in both ankles forced her to withdraw temporarily from professional tennis in 2002 at the age of 22. After several surgeries and long recuperations, Hingis returned to the WTA tour in 2006. She then climbed to world no. 6 and won three singles titles.
In June 2011, she was named one of the "30 Legends of Women's Tennis: Past, Present and Future" by Time. In 2013 Hingis was elected into the International Tennis Hall of Fame.
In July 2013, Hingis came out of retirement to play a doubles tournament in California and said she might also play singles and doubles tournaments in the future.