What defines success for this year’s Celtics?

Boston, MA - October 14: Boston Celtics head coach Joe Mazzulla talks to guards Derrick White and Payton Pritchard in the second quarter. The Boston Celtics played the Charlotte Hornets in a preseason game at TD Garden on October 14, 2026. (Photo by Barry Chin/The Boston Globe via Getty Images) | Boston Globe via Getty Images BOSTON — When the Celtics rotated their bench into the game against the 76ers in the preseason, Jayson Tatum stayed on the TD Garden parquet joined by Baylor Scheierm