Jayson Tatum produced a dazzling 31-point display as the Boston Celtics dominated the Dallas Mavericks 106-88 to clinch a record-breaking 18th NBA championship crown on Monday.

Humbled by Dallas in a 38-point game four drubbing on Friday, Boston slammed the door on any chance of a Mavericks fightback to seal a 4-1 series victory at an electric TD Garden.

Tatum spearheaded a superb performance at both ends of the floor as Boston pulled clear of their arch-rival Los Angeles Lakers to stand alone with 18 NBA titles.

The emphatic win came 16 years to the day after Boston's last NBA Finals win – over the Lakers – in 2008. (AFP)