Martina Hingis (born 30 September 1980) is a Czechoslovak-born Swiss professional tennis player who spent a total of 209 weeks as the singles world No. 1 and has won five Grand Slam singles titles (three at the Australian Open, one at Wimbledon, and one at the US Open), twelve Grand Slam women's doubles titles, winning a calendar-year doubles Grand Slam in 1998, and five Grand Slam mixed doubles titles; for a combined total of twenty-two major titles. In addition, she has won the season-ending WTA Championships two times in singles and three times in doubles and is an Olympic medalist, winning a silver medal at the 2016 Summer Olympic Games.

Hingis set a series of "youngest-ever" records during the mid and late 1990s, including youngest-ever Grand Slam champion and youngest-ever world No. 1. Before ligament injuries in both ankles forced her to withdraw temporarily from professional tennis in 2002, at the age of 22, she had won 40 singles titles and 36 doubles titles and, according to Forbes, had been the highest-paid female athlete in the world for five consecutive years, 1997 to 2001. 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 benzoylecgonine, a metabolite of cocaine, during the 2007 Wimbledon Championships, which led to a two-year suspension from the sport.

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