Boston Celtics outclassed Dallas Mavericks 106-88 to clinch a record-breaking 18th NBA championship crown on Monday. After suffering a humbling by Dallas in a 38-point game four drubbing on Friday, Boston ended any hopes of a Mavericks fightback to seal a 4-1 series victory. Boston Celtics pulled clear of their arch-rival Los Angeles Lakers to stand alone with 18 NBA titles. The win came 16…
