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Front Office Sports on Twitter: "Within five years of turning pro, both Williams sisters were earning over $2M per year. Their marketability opened the endorsement floodgates ✍️ In 2000, Venus signed a
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Serena Williams on Twitter: "Especially proud to be a part of the Nike family today. #justdoit https://t.co/GAZtkAIwbk" / Twitter
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Serena Williams says Nike is 'learning from mistakes and doing better' in paying female athletes - MarketWatch
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By Signing an Exorbitant $60 Million Nike Deal, Serena Williams Became the Only Athlete After Andre Agassi to Achieve Splendid Feat in 2003 - EssentiallySports
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