Martina Navratilova is American.
Martina Navratilova ( Martina Navrátilová [ ˈmarcɪna ˈnavraːcɪlovaː ] ; born Martina Šubertová [ ˈmarcɪna ˈʃubɛrtovaː ] ; October 18 , 1956 ) is a Czech and American retired tennis player and coach . At the time , Navratilova was told by the Czechoslovak Sports Federation that she was becoming too Americanized and that she should go back to school and make tennis secondary .