NBA History: 25 former NBA stars you forgot dominated the league 

Gilbert Arenas
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1) Bradon Roy

Former Rookie of the Year Bradon Roy had a promising career ahead of him but knee injuries kept him from realizing his full potential. His career lasted just six seasons, including his first five years in Portland. The Blazers hoped that Roy, LaMarcus Aldridge, and Greg Oden would be a championship core, but that obviously didn't happen.

Oden couldn't stay healthy, and neither could Roy, despite him being a terrific player when healthy. He managed to make three straight all-star teams in a stacked Western Conference, proving that he was among the best players in the league at the time. In fact, he is one of just 40 players in NBA history to score 55 points or more in a regular-season game.

Not only that but he also led Portland to an unbelievable 23-point comeback in the NBA playoffs by scoring 18 points in the fourth quarter. That proved to be one of his final games in the NBA. He missed all of the 2011–12 season and only played five games for the Minnesota Timberwolves before retiring for good at 28 due to chronic knee issues. That's unfortunate since, despite his skill, he didn't play long enough to have a long-lasting impact.