Who is the youngest female tennis player?

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Tags

1. #player
2. #grand
3. #world
4. #professional
5. #ranked
6. #person
7. #czechoslovakia
8. #swiss
9. #title
10. #slovakia
11. #youngest
12. #number
13. #singles
14. #september
15. #became
16. #hingis
17. #martina
18. #tennis