Tatum's injury will keep him out next season, likely eliminating the team's title chances for now. In the meantime, the Celtics can develop young talent such as No. 28 overall pick Hugo Gonzalez until they're ready to contend again.

LAS VEGAS — Jordan Walsh called his ejection Monday against the Heat a “rookie mistake.” His coach, Joe Mazzulla, watching from high in the bleachers of Cox Pavilion with his family, texted his young swingman and said he “loved” the fire.

LAS VEGAS — The Celtics lost for the first time in Summer League, falling to the Heat 100-96 on Monday at the Cox Pavilion. The C’s rallied from a double-digit deficit but the Heat made just enough shots down the stretch to secure the victory. Boston dropped to 2-1 in Summer League play.

The upshot of the Heat’s summer-league victory Monday night against the Celtics was that meaningful boxes were checked off.

The Boston Celtics head coach quickly let Jordan Walsh know his feelings on his ejection against the Miami Heat

LAS VEGAS — One of the most revealing moments of Hugo González’s summer league debut came at halftime.