Nike Inc (NYSE: NKE) has reigned over the sports world for more than a generation, but its grip on the crown is starting to weaken.
First, it failed to make the best-selling sneaker in the country for the first time in more than a decade last year as the throwback Adidas (NASDAQOTH: ADDYY) Superstar claimed the top spot. Nike filled out the rest of the top ten, but that was small consolation for a company accustomed to winning.