Original: SFR Yugoslavia 1990 Steffi Graf 1989 Steffi Graf 1988 Steffi Graf 1987 Steffi Graf 1986 Martina Navrátilová 1985 Martina Navrátilová 1984 Martina Navrátilová 1983 Martina Navrátilová 1982 Martina Navrátilová  Martina Navrátilová, originally from Czechoslovakia, became a U. S. citizen in 1981.
Simplified: Martina Navrátilová, originally from Czechoslovakia, became a U. S. citizen in 1981.