Click here to see the full TIME100 Sports list I first saw LeBron James play in person in July 2003 during a now defunct NBA Summer League. Some 2,500 people showed up each night for one of six games in what felt like a high school basketball gym on the campus of UMass Boston. Tickets were $15. “I remember the gym, the atmosphere,” James later said . “It was old-school and hot, and the fans, mostly Celtics fans, were right on top of you.” The year before, Sports Illustrated put James on the