In 2005, the NBA passed a rule stating that all players wanting to enter the draft must be at least 19 years of age and one year out of high school.
This ended a period of about 30 years where high school graduates could move to the NBA after graduation at will, beginning with Moses Malone in 1974.
Throughout the '90s and into the early 2000s, this became more and more common as future stars like Kevin Garnett, Kobe Bryant, Tracy McGrady, Amar'e Stoudemire, LeBron James and Dwight Howard all decided to pass on college and say hello to the pros.
Growing tired of high school games being flooded with scouts, the NBA passed the current rule, which has seen its share of pros and cons.
For one, the college game has greatly improved, as stars like Anthony Davis, Harrison Barnes and Austin Rivers would have likely forgone their college experience.
The disadvantage, though, is that fans of the NBA and their teams must wait an extra year to see tomorrow's stars in action.
So which high school players would have made the jump this year? Who are some of the nation's best prep stars who would have been sure-fire first-rounders in this year's draft?
Here are five of the best.