Which groundbreaking athlete endorsement deal established the precedent of signature products and revenue sharing that revolutionized sports marketing?

Product endorsements in sports have evolved dramatically over the decades, transforming athletes into global brands and changing the economics of professional sports. This trivia question focuses on a historic endorsement deal that revolutionized how athletes and sports brands collaborate, setting new standards for athlete marketing and creating a template that continues to influence sports business today.

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Michael Jordan's deal with Nike creating the Air Jordan line (1984)
Tiger Woods' initial endorsement with Titleist (1996)
Serena Williams' partnership with Puma (1998)
David Beckham's lifetime deal with Adidas (2003)