Here is a semi-final that was awaited, dreamed of, hoped for by women's tennis fans. Face to face, two of the best players in the world are facing each other for the fifth time. 16 years old separates the best player in the world today, Naomi Osaka, and the best player of all time, Serena Williams. But their level of play is close and there is great uncertainty about the outcome of this semi-final.
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