Boston Celtics at Dallas Mavericks

Jaylen Brown leads Celtics over Mavs 110-100 despite Flagg's latest record for teenager

Flagg scored 36 points in the rookie No. 1 pick's first meeting with the team he grew up watching because Boston was the closest NBA city to his hometown, about 200 miles south of Newport, Maine.

The 19-year-old became the first teenager with three consecutive 30-point games five nights after setting the NBA scoring record for the under-20 group with 49 against Charlotte. Flagg had nine rebounds and six assists.

Payton Pritchard scored 26 points for the Celtics, who were playing without Anfernee Simons. Nikola Vucevic for Simons in a trade with Chicago earlier in the day, a person with knowledge of the deal told The Associated Press.

Luka Garza scored nine consecutive Boston points on 3-pointers during a 14-4 run that finished the third quarter and gave the Celtics an 86-67 lead. Garza made all four of his attempts from 3 and scored 16 points in 20 minutes.

Pritchard scored 15 points in the first half on 7-of-10 shooting, and the Celtics didn't trail again after Brown hit a tying 3-pointer and scored again from long range midway through the first quarter. Boston led by 23 points in the second half.

Daniel Gafford had 10 points and 12 rebounds for the Mavericks despite aggravating a right ankle injury that has sidelined him for 16 games this season. Gafford exited in the second quarter but returned in the third.

Caleb Martin scored 11 of his 13 points in the first half for Dallas.

Up next Celtics: At Houston on Wednesday to finish a quick two-game road trip in Texas.

Mavericks: San Antonio at home Thursday before visiting the Spurs on Saturday.

Regular Season Series

BOS leads series 1-0