What happened: The Boston Celtics held out eight rotation players, including Jayson Tatum and Paul George, for their preseason opener against the Cleveland Cavaliers. Assistant coaches Tony Dobbins and DJ MacLeay split head coaching duties for the contest to gain developmental experience.

Why it matters: With the primary rotation resting, training camp invitees and young reserves received extended evaluations. The available minutes offered a closer look at recent additions like Baylor Scheierman and Jordan Walsh as they compete for regular-season depth roles.

What to watch: Boston will continue to evaluate its training camp roster as preseason play continues.