She won the German Open three consecutive years from 1972 through 1974, beating Martina Navratilova in the 1974 final in three sets. Masthoff was the runner-up at that tournament in 1971, losing to Billie Jean King.
She won the German Open three consecutive years from 1972 through 1974, defeating Martina Navratilova in the 1974 final in three sets. Masthoff was runner-up at that tournament in 1971, losing to Billie Jean King.