“So Williams tries to put money in deals where her fame and brand and platform grow the pie. As one of the better product endorsers of this century, it’s something she’s honed in ways that most musicians and actors (who turn up their noses at most product deals) have not. She counts nearly 30 million followers across social media—her posts of herself wearing Nike’s swoosh generated more than $2 million in promotional value for the brand over the past 12 months, according to Hookit, which tracks celebrity influence on social media. “Serena is a once-in-a-generation voice, reaching a global audience that extends well beyond tennis,” says Hookit CEO Scott Tilton.”