Martina Navratilova is a tennis player.
Martina Navratilova ( Martina Navrátilová [ ˈmarcɪna ˈnavraːcɪlovaː ] ; born Martina Šubertová [ ˈmarcɪna ˈʃubɛrtovaː ] ; October 18 , 1956 ) is a Czech and American retired tennis player and coach . In 2005 , Tennis magazine selected her as the greatest female tennis player for the years 1965 through 2005 . Navratilova is regarded by some to be the greatest female tennis player of all time . She is one of only five tennis players all-time to win a multiple slam set in two disciplines , matching Margaret Court , Roy Emerson , Frank Sedgman and Serena Williams .