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Tyus Jones, PG, Minnesota Timberwolves, Age 20
In an alternate universe, Tyus Jones isn't buried behind Ricky Rubio and Kris Dunn. In our universe, Jones can only tantalize with what he could do in a regular role. This season, he's hitting 37.3 percent from three and is tossing out 4.13 assists for every turnover.
Thon Maker, PF/C, Milwaukee Bucks, Age 20
Few prospects are more tantalizing right now than Thon Maker. The rail-thin 20-year-old brings three-point range, relentless energy and guard-like handles in a 7'1" frame. But he's as raw as organic granola (40th among rookies in total minutes) and is a foul machine currently (5.8 per 36 minutes).
Dejounte Murray, PG, San Antonio Spurs, Age 20
Should we credit Dejounte Murray for his impressive shooting rates (43.4 from the field, 40.9 outside) and across-the-board per-36-minute production (15.4 points, 5.4 assists and 4.2 rebounds)? Or is this more a reflection of growing in the NBA's best environment alongside a fully loaded roster? We'll need more than 280 NBA minutes to decide.
Ben Simmons, SF, Philadelphia 76ers, Age 20
Talent-wise, Ben Simmons not only belongs on this list, but he deserves a place somewhere near the top. But how do you assess the NBA talents of a player who won't make his debut until next season? You don't—you acknowledge his skills in this section and save the rankings for those who have actually played.
Ivica Zubac, C, Los Angeles Lakers, Age 19
Despite playing just seven times in L.A.'s first 42 games, Ivica Zubac still ranks fourth among freshmen in double-doubles (albeit with only three). The 19-year-old hasn't yet been a rotation regular for a full two months, but the early returns are promising—he's averaging 7.6 points and 4.9 rebounds in 17.7 minutes over his last 17 outings.
Source : http://bleacherreport.com/articles/2695909-nba-top-22-under-22-ranking-the-leagues-top-young-stars427