Report: Robert Williams III working on on-ball offense, being more ‘selfish’

Celtics center Robert Williams III could come into next season as a much better offensive player.Robert Williams III has had a very busy summer.

Celtics

NBC Sports’ Chris Forsberg reports that Williams has been working on expanding his offensive game with skills trainer Aaron Miller. In particular, Williams has been working on his on-ball offense, a relatively unpolished skill for him.

Williams told Miller that he wishes to be more “selfish” with the ball, something that his teammates want from him.

“[Jayson Tatum is] mad at Rob when he isn’t taking shots,” Miller told Forsberg. “And he is mad at Rob — not mad, but holding him accountable — when he isn’t taking shots and when he isn’t being a…