With Li also earning big deals, Eisenbud is akin to football's "super agents" such as Jorge Mendes, who works with Cristiano Ronaldo and Jose Mourinho.
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"Rather than competing against one another, Sharapova and Na actually provide Eisenbud's business with much greater global coverage, " British sports business expert Simon Chadwick told CNN.
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Eisenbud may work with other players -- he has a group of young hopefuls as well as Li -- but he says Sharapova will always be his focus.