Martina Hingis is a 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 . 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 .