Who is Bryce Harper? Well, he first appeared on the cover of Sports Illustrated when he was 16, which created a circus of hype about his impending stardom. Because of that early attention, he's one of the few baseball players with name cachet outside of the sport, which is one reason his free agency is being followed with such intense interest. Plus, he's a guy with great hair. He's not the best player in the game, but he's arguably the most famous.
Harper finished high school a year early, spent a year in junior college, was the first overall pick by the Nationals in the 2010 draft, reached the majors at age 19 in 2012, won the National League MVP award in 2015 and enters free agency at 26.