There are some givens for next year’s Celtics starting lineup: Jayson Tatum and Derrick White will be part of the opening five and you can pretty much pencil in Paul George at the 3. Joe Mazzulla has options at center. Neemias Queta was a revelation last year and signed a four-year extension to keep in Boston long term, but he’ll compete with the newly signed Mitchell Robinson for playing time.

Heading into training camp, that fifth starter is the bigger mystery. Last year, it was Sam Hauser as the fifth Beatle. Before Tatum’s return, Baylor Scheierman got some run as a point forward with Payton Pritchard moving to the bench after Anfernee…

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