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Serena Williams of the USA celebrates winning her finals match against Victoria Azarenka of Belarus during day seven of the 2014 Brisbane International at Queensland Tennis Centre on January 4, 2014 in Brisbane, Australia.
Serena Williams of the USA celebrates winning her finals match against Victoria Azarenka of Belarus during day seven of the 2014 Brisbane International at Queensland Tennis Centre on January 4, 2014 in Brisbane, Australia.

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    Serena Williams bringing in new sponsors

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Serena Williams bringing in new sponsors

Sports economist Patrick Rishe discusses the endorsement income gap between Serena Williams and Maria Sharapova.

Serena Williams bringing in new sponsors

Sports economist Patrick Rishe discusses the endorsement income gap between Serena Williams and Maria Sharapova.