Cleveland Cavaliers, 2003-04
One of the most-hyped rookies in NBA history, LeBron James impressed from the start. After several of his high school games were aired on national television, LeBron stepped into the NBA limelight seamlessly. He became the youngest player in history to win Rookie of the Year and is also the youngest to have scored 40 points in a game. He's also one of four players in history to average 20 points, five rebounds and five assists in his first season.