Because of the professional tennis heights risen
to by Martina Navratilova who was born in Czechoslovakia, Monica Seles who was born in Yugoslavia, Martina Hingis who was born in Czechoslovakia, Maria Sharapova from Russia
and Simona Halep from Romania. These five
women are each within the top 20 women tennis
players of all time.
Professional Tennis Data Below Taken from TennisExplorer.com
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https://www.tennisexplorer.com/ranking/wta-women/?page=2