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And though Serena’s success is arguably largely self-made, she readily admits to having mentors, including Facebook COO, Lean In guru and friend Sheryl Sandberg (No. 12 on this year’s list) and especially husband and tech investor Alexis Ohanian, himself worth $70 million, according to Forbes’ estimations.

“I’ve been really leaning on Alexis,” Serena says. “I’d like to call us a more modern business family.”

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“She is determined to be great at everything she does,” says Ohanian, in turn.

And while Serena’s showing at the recent French Open may not have turned out the way she’d hoped, she maintains the same approach to her business as her storied serves.

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“I want to create a brand that has longevity, kind of like my career,” she says. “It’s not fancy, it’s not here, it’s not out, it’s not trendy, it’s a staple, like my tennis game.”