16. LeBron James
Achievements as a Teen: LeBron James, the scrawny kid from Ohio, has blossomed into the most dominating player in the game at the moment. He first took the Association by storm when he took home Rookie of the Year honors at 19 and became the youngest player in NBA history to score 40 points in a game. At the end of his rookie campaign he joined Oscar Robertson and Michael Jordan as the only players in NBA history to average at least 20 points, five rebounds, and five assists per game in their rookie season.
Career Recap: After putting his days in Cleveland behind him, LeBron has moved onto bigger and better things in South Beach. He was finally crowned an NBA champion in 2012 as well as taking home the Finals MVP. He is already a three-time (with a fourth one on the way in a couple months) NBA MVP, and a nine-time All-Star. He has one scoring title and is a six time All-NBA first team selection. In addition to all that, King James is a four time All-Defensive first team member and he was hailed as the Sports Illustrated Sportsman of the Year in 2012. Whether Cleveland fans have any love for him or not, he's the Cavs all-time leading scorer, and he has two Olympic gold medals to his name to top off his ever growing resume. The world waits to see just how many accolades LeBron will end up with when he decides to hang 'em up.