Jaylen Brown, Jayson Tatum, Celtics embrace challenge of repeat

(Photo credit: Peter Casey-Imagn Images)
Not long after the Boston Celtics won the NBA title in 2008, some new wall decor went up at their practice facility in Waltham, Mass.

It was a banner. An 18th one. But it stood out from the rest. It was completely blank, its story not yet written.

For well over a decade, that blank canvas showed that the Celtics' most important championship was simply the next one. Players came a