Martina Hingis is a professional tennis player.
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 . She has won five Grand Slam singles titles , 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 . 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 . The Women 's Tennis Association ( WTA ) , founded in 1973 by Billie Jean King , is the principal organizing body of women 's professional tennis .