Boston Celtics head coach Brad Stevens is impressed with New York Knicks rookie forward RJ Barrett.

Stevens says Barrett “looks way above his age.”

“The first time I saw him in person up close here was the third game of the season and his body, physicality, skill level, all ready for the NBA. I think that’s pretty unique for a wing in the league,” Stevens said, via Ian Begley of SNY.

“Even some of the better wings fill out over time. He already looks way above his age both from a maturity standpoint, playing standpoint and certainly from a physical standpoint.”

The Knicks lost to the Celtics on Sunday by a final score of 113-104. Barrett played 35 minutes and finished with 16 points and seven rebounds.

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On the season, RJ is averaging 15.4 points, 5.5 rebounds and 3.3 assists per game. The lefty is shooting 41.0 percent from the field, 32.8 percent from beyond the arc and 52.4 percent from the free-throw line.

Barrett has to get his free-throw shooting percentage up. A scorer like him can’t shoot that putrid from the charity stripe.

The Knicks aren’t expected to make the playoffs this season. This year is all about developing Barrett, Dennis Smith Jr., Kevin Knox, Mitchell Robinson and Allonzo Trier the right way.