With so many prospects reaching the NBA while they're still teenagers, it's easy to forget that some of the league's biggest stars still have a lot of growth left in them—at least in theory.
Some of those stars won't get that much better, their development more or less plateauing after three or four years at the pro level. Others have only given us a hint of what they're capable of doing.
So which stars are destined for greatness, and which ones are as good as they're going to get?
We'll find out shortly.
But first, there are some rules to these rankings—there has to be some way of defining what counts as a young star, and the candidates can't be so good that their ceilings are already obvious.
So, the rankings won't include All-Stars (e.g. Derrick Rose), players 24 and over (sorry Ty Lawson fans) or any rookies (they already get enough attention).
With our pool of possibilities narrowed, here's a look at the 15 young stars with the most potential.