Martina Hingis was born in 2007.
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 . Hingis set a series of `` youngest-ever '' records during the 1990s , including youngest-ever Grand Slam champion and youngest-ever world No. 1 . Widely considered an all-time tennis great , Hingis was ranked by Tennis magazine in 2005 as the 8th-greatest female player of the preceding 40 years .