The world's number one female tennis champion is Serena Williams. Williams represents the United States, and has been ranked number one female champion in the world on six different occasions.
The youngest f.I.f.A player is 22 year old Lionel Messi.
Matthew Dumont is the worlds best tennis player under 13's since 2006
After US Open. He is the guy ... Novak Djokovic ...
The world's youngest millionare is Sierra Leon
The worlds youngest teacher is zero.