Which celebrity endorsement deal is credited with revolutionizing athlete brand partnerships and creating the modern signature product line model?

Throughout history, famous personalities have lent their faces and voices to products, creating some of the most memorable marketing campaigns. Celebrity endorsements can transform a brand's perception overnight, boost sales dramatically, and create lasting cultural associations. How well do you know the strategic partnerships between celebrities and products that changed the marketing landscape?

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Michael Jordan's partnership with Nike (Air Jordan)
Tiger Woods' endorsement deal with American Express
David Beckham's Adidas sponsorship
Serena Williams' collaboration with Puma