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How many high school stars make it in the NBA?

Every year the top high school basketball recruits get hyped up. How often do they pan out?

Remember NBA great Donnell Harvey? Neither do we. Despite being the #1 high school recruit in 2000—something that you think would indicate future NBA stardom—he put together a meager career in the league, averaging around 5 points per game over 5 years. On the flip side is LeBron James—the #1 high school recruit just a few years later—and we all know what he’s been up to.

This disparity got us thinking, are these top 100 recruit lists any indication of making it to the NBA, let alone becoming a star?

It must be really hard to assess top talent when the pool is so large in high school. Now that we’ve entered the YouTube era, hype surrounding players can inflate in an instant. Sure, LeBron paved the way with some nationally televised games, but now millions of people are watching Zion Williamson throw down dunks in warm ups, or Lamelo Ball hit threes from half court in eight grade.

Let’s take a look at just how far the high school stars of the past 20 years made it in their basketball careers.

Below, each circle is a player that ranked amongst the top 100 high school recruits in the US according to the Recruiting Services Consensus Index.

High school rank:

    Level Reached of Top 100 High School Players

    Percentage of players that reach each level (out of 1,563 players) from 1998 - 2013

    27% of the 1,563 top-ranked high school players made it to the NBA and only 25% made it past their two-year rookie contract. Put another way, 441 of the 900 draft picks in that 15 year span were top 100 recruits. Just 31 players eventually reached “superstar” status (based on advanced statistics, details at the bottom).

    But perhaps the top 100 is too broad of a categorization. Surely the top 10 players will make it to the NBA more often, right?

    High school rank:

      Level Reached of Top 10 High School Players

      Percentage of players that reach each level (out of 158 players) from 1998 - 2013

      Players ranked in the top 10 certainly appear to have slightly better odds—a full 84% of them eventually made it to the NBA. Though with 60 draft picks a year, you might expect that number to be higher.

      In the late 1990’s and early 2000’s, teams could bet hard enough on a player’s future success that they could draft them straight out of high school. This ended in 2006 when a rule was put into place, declaring that players had to be at least 19 years old or one year removed from high school before getting drafted. But talks are escalating about reversing this rule, especially in light of the “shoe incident”. Let’s look at the success of the straight-to-NBA high school players.

      High school rank:

        Level Reached of Straight-to-NBA HS Players

        Percentage of players that reach each level (out of 35 players) from 1998 - 2005

        Opponents of removing the age limit often cite players like Korleone Young as reasons to keep it in place. Young, the #3 ranked high school player in 1998, ultimately fizzled out of the NBA having played only 15 minutes across 3 games. However, he appears to be the exception more than the rule. Of the other 34 players drafted straight out of high school, 94% made it past their rookie contract, with 55% eventually becoming mediocre or better NBA players.

        Let’s switch our view once more, away from the highest ranking high school players to those that played in a US high school, but did not appear on the top 100 list. We found 338 of these players that were eventually drafted into the NBA, despite being undervalued in high school. Let’s compare their career paths with our highly-ranked and drafted high schoolers.

        High school rank:

          Level Reached of Drafted Top & Unranked HS Players

          Percentage of players that reach each level (out of 779 players) from 1998 - 2013

          Even when we limit the top ranked players to just those that were eventually drafted, the success rate of players ranked in high school is notably higher than for those who weren’t. Where 92% of the drafted and ranked players made it past their rookie contract, only 73% of the unranked and drafted players stayed more than two years. Seven players—Dwyane Wade, Marc Gasol, Paul George, Jimmy Butler,Russell Westbrook, Stephen Curry, and Damian Lillard—whose high school careers were apparently not worthy of a spot amongst the top 100, still broke into the ranks of superstars in their NBA careers.

          Let’s look at one more slice that has lofty expectations; The Big 4. Kentucky, Kansas, Duke, and UNC are known to consistently land the biggest recruits. Do these recruits translate into NBA success stories or is college their last stop?

          High school rank:

            Level Reached of Players from Kentucky, Kansas, Duke, and UNC

            Percentage of players that reach each level (out of 157 players) from 1998 - 2013

            The college funnel is an interesting discussion, especially when it surrounds the lack of pay for NCAA student athletes. Below we widen the field to take a look at the biggest NBA-producing colleges and see how many yield NBA talent.

            Methods

            High school ranking data is based on the Recruiting Services Consensus Index (RSCI) rankings. Data from Basketball Reference. We used a combination of VORP and Estimated Wins Added to determine the level of success in an NBA career, limiting to the mean ranking of each player’s top five season. “Superstar” = top 30, “Great” = top 60, “Mediocre” = top 120, “Below Average” = 120+. H/T to Austin for the idea.