An underdog ethic is still baked into company lore, even though last year Under Armour overtook Adidas to become the second-biggest sportswear brand in the U.S. In May, the company signed the largest sponsorship deal in the history of college sports, paying $280 million for a 15-year contract with UCLA. The company has invested more than $700 million in fitness apps and activity-tracking technology, and it hired the designer Tim Coppens, a ready-to-wear rising star, to help snag a portion of the lucrative “athleisure” market. ... These days, Under Armour looks like an underdog only when held up against Nike, a company that Plank and other executives refuse to even name. “Five years ago, our largest competitor was 12 times our size,” Plank says. “Then it was 11 times, then 10 times. Today, they’re roughly six times our size. But the fact is, they’re still six times our size. So we have a lot of work to do.” He clearly relishes the idea of the world’s biggest sportswear company feeling Under Armour breathing down its neck. ... Plank’s appreciation for the overlooked and underestimated—he’s the youngest of five brothers—is manifest in his affection for Baltimore. On the surface, there may not seem to be much linking the edgy, gritty city of John Waters and The Wire with Under Armour’s performance-bro aesthetic. But Plank sees an affinity between Baltimore’s hardworking, blue-collar past and his company’s relentless striving to be the best sportswear company out there.