Martina Hingis (born 30 September 1980 in Košice, Slovakia, then Czechoslovakia) is a Swiss professional tennis player who spent a total of 209 weeks as World No. 1. She is known as the "Swiss Miss". She has won five Grand Slam singles titles, three at the Australian Open (1997 to 1999), one at Wimbledon (1997) and one at the U.S. Open (1997). She is a dominant player in doubles, winning 10 Grand Slam doubles titles and 3 mixed doubles titles.