As one of the youngest players in the NBA — and also in Nets history — Noah Clowney has to grow in terms of both experience and frame. Brooklyn is counting on it.

And through training camp and the first preseason games of his career, Clowney is already starting to show signs of that growth, pains and all.

After looking overmatched at points during Las Vegas Summer League in July, the teenager was already much-improved when he returned to the same city just three months later.

He stood out in Monday’s preseason opener against the Lakers in Las Vegas, and was active in Thursday’s win over Israeli club Maccabi Ra’anana.