June 20 , 2019
1903 days
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- Naomi Osaka of Japan stands No.1 in Women’s Tennis Association (WTA) rankings.
- WTA was founded in 1973 by Billie Jean King, to govern women’s tennis.
- Novak Djokovic of Serbia stands No.1 in Association of Tennis Professionals (ATP) rankings.
- ATP was founded in September 1972 by Jack Kramer, Donald Dell, and Cliff Drysdale to govern men’s tennis.
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