Which famous athlete's switch from Adidas to Under Armour in 2013 helped the underdog brand gain significant market share and was considered one of the most expensive endorsement deals at that time?

Celebrity endorsements can make or break product launches, creating instant recognition and credibility for brands. However, when celebrities switch allegiances between competing companies, it can cause major disruptions in marketing strategies. This poll tests your knowledge about one of the most significant celebrity endorsement shifts in recent retail history that changed the trajectory of a major athletic brand.

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Stephen Curry
Serena Williams
Cristiano Ronaldo
Simone Biles