Boston Celtics win record-setting 18th NBA title with 106-88 victory over the Dallas Mavericks

A number of Boston Celtics lived down their reputations Monday night. One lived up to it. All of it translated into an 18th championship for the men in green with a 106-88 win over the Dallas Mavericks, breaking a tie with Boston’s hated rival, the Los Angeles Lakers, for the most titles in NBA history.

Jayson Tatum, regarded as a great player a few…