Which athlete's endorsement deal first included a signature product line that earned them royalties on each item sold, revolutionizing how athletes monetize their brand?

Product endorsements are a cornerstone of the sports industry's marketing ecosystem. Athletes signing lucrative deals can transform both their careers and a brand's market position. But how much do you really know about the business mechanics behind these partnerships? This trivia question explores an interesting aspect of sports endorsement history that changed how these deals are structured today.

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Michael Jordan with Nike's Air Jordan (1984)
Arnold Palmer with Pennzoil (1962)
Billie Jean King with Adidas (1973)
Joe Namath with Schick razors (1969)