17. Brandon Roy:
Roy’s story is unfortunately quite similar to that of the aforementioned Billy Sims. The ultra-talented basketball player spent six seasons in the NBA, showing the promise to be one of its most talented stars for many years to come. Indeed, he won the NBA Rookie of the Year award in 2007, made three All-Star games, and two All-NBA teams in only six seasons.
Roy was so effective in his early NBA run, in fact, that the legendary Kobe Bryant was even quoted as saying that he had “no weaknesses in his game.” Poised to take the league by storm, he was signed to a max contract extension by the Portland Trailblazers. But tragedy struck when Roy was diagnosed with a degenerative knee condition that eventually forced him to retire after playing only five games for the Minnesota Timberwolves in 2012. Roy could have legitimately been one of the greats.