Which athlete's endorsement deal is credited with revolutionizing sports marketing by including an unprecedented royalty structure and dedicated product line, creating the template for modern signature athlete collections?

Athletic endorsements have transformed from simple product placements to billion-dollar strategic partnerships. These deals not only define athletes' careers financially but often reshape entire product categories and market segments. This question explores a pivotal moment in sports endorsement history that changed how athletic brands approach athlete partnerships.

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Michael Jordan with Nike (Air Jordan, 1984)
Tiger Woods with Titleist (1996)
David Beckham with Adidas (Predator boots, 1998)
Andre Agassi with Nike (Challenge Court, 1988)