Celtics win 18th NBA championship with 106-88 Game 5 victory over Dallas Mavericks

The Boston Celtics again stand alone among NBA champions.

Jayson Tatum had 31 points, 11 assists and eight rebounds as the Celtics topped the Dallas Mavericks 106-88 on Monday night to win the franchise's 18th championship, breaking a tie with the Los Angeles Lakers for the most in league history.

Boston earned its latest title on the 16th anniversary of hoisting its last Larry O'Brien Trophy in 2008. It marks the 13th championship won this century by one of the city's Big 4 professional sports franchises.

Jaylen Brown added 21 points and was voted the NBA Finals MVP. Jrue Holiday finished with 15 points and 11 rebounds. Center Kristaps Porzingis also provided an emotional lift, returning from a two-game absence because of a dislocated tendon in his left ankle to chip in five points in 17 minutes.

It helped the Celtics cap a postseason that saw them go 16-3 and finish with an 80-21 overall record. That .792 winning percentage ranks second in team history behind only the Celtics' 1985-86 championship team that finished 82-18 (.820).

Second-year coach Joe Mazzulla, at age 35, also became the youngest coach since Bill Russell in 1969 to lead a team to a championship.

Luka Doncic finished with 28 points and 12 rebounds for Dallas, which failed to extend the series after avoiding a sweep with a 38-point win in Game 4. The Mavericks had been 3-0 in Game 5s this postseason, with Doncic scoring at least 31 points in each of the them.

Kyrie Irving finished with just 15 points on 5-of-16 shooting and has now lost 13 of the last 14 meetings against the Celtics team he left in the summer of 2019 to join the Brooklyn Nets.

NBA teams are now 0-157 in postseason series after falling into a 3-0 deficit.

Boston never trailed and led by as many as