Celtics remind Cavaliers: NBA's East still runs through Boston

Jayson Tatum led the Celtics with 33 points in their 120-117 victory Tuesday to end Cleveland's 15-0 start to the season. (Photo by Winslow Townson/Getty Images)BOSTON — Everyone knew the deal. The Cleveland Cavaliers entered Tuesday's game against the reigning champions with a 15-0 record, second-best start to a season ever, and it was an NBA Cup game to boot.

"We knew," said Boston Celtics guard Derrick White. "Everybody knew."

In front of a national television audience, the Celtics reminded the Cavaliers that the Eastern Conference still runs through Boston. They made five of their first eight 3-point attempts, took an 18-8 advantage midway through the opening quarter and never trailed…