Martina Navratilova is American and Czech.
Martina Navratilova ( Martina Navrátilová [ ˈmarcɪna ˈnavraːcɪlovaː ] ; born Martina Šubertová [ ˈmarcɪna ˈʃubɛrtovaː ] ; October 18 , 1956 ) is a Czech and American retired tennis player and coach . Navratilova became a US citizen in 1981 , and on January 9 , 2008 , she acquired Czech citizenship .