Dallas Mavericks rookie Cooper Flagg played the Boston Celtics for the first time on Tuesday and was the leading scorer in the game.Flagg finished with 36 points, nine rebounds, six assists and two blocks against the Celtics, his favorite NBA team while growing up in Newport, Maine.At 19 years and 44 days old, Flagg became the youngest player in NBA history to score 30 or more points in three straight games. He scored a career-high 49 on Jan. 29 against the Charlotte Hornets and finished with 34 points against the Houston Rockets two days later.Flagg also became just the fourth teenager in NBA history to record multiple games of 35 or more points, five or more rebounds and five or more assists. The others are LeBron James, who did it four times, and Kevin Durant and Luka Doncic, who each did it twice. On Dec. 15, 2025, Flagg recorded 42 points, seven rebounds and six assists against the Utah Jazz.The Celtics, however, defeated the Mavericks 110-100 in Dallas. All-Star Jaylen Brown posted a double-double of 33 points and 11 rebounds for Boston.Earlier on Tuesday, Flagg was named Western Conference Rookie of the Month for January, making him a perfect three-for-three with the award to start the season. Brown, meanwhile, was named Eastern Conference Player of the Month for January.The Celtics also traded for center Nikola Vucevic on Tuesday, acquiring the 15-year NBA veteran and a second-round pick from the Chicago Bulls in exchange for guard Anfernee Simons and a second-round pick, according to Shams Charania of ESPN.Simons missed Tuesday’s game against the Mavericks due to personal reasons, according to the Celtics’ injury report.Flagg will look to keep his scoring streak going on Thursday, as the Mavs host the San Antonio Spurs.

DALLAS —

Dallas Mavericks rookie Cooper Flagg played the Boston Celtics for the first time on Tuesday and was the leading scorer in the game.

Flagg finished with 36 points, nine rebounds, six assists and two blocks against the Celtics, his favorite NBA team while growing up in Newport, Maine.

At 19 years and 44 days old, Flagg became the youngest player in NBA history to score 30 or more points in three straight games. He scored a career-high 49 on Jan. 29 against the Charlotte Hornets and finished with 34 points against the Houston Rockets two days later.

Flagg also became just the fourth teenager in NBA history to record multiple games of 35 or more points, five or more rebounds and five or more assists. The others are LeBron James, who did it four times, and Kevin Durant and Luka Doncic, who each did it twice. On Dec. 15, 2025, Flagg recorded 42 points, seven rebounds and six assists against the Utah Jazz.

The Celtics, however, defeated the Mavericks 110-100 in Dallas. All-Star Jaylen Brown posted a double-double of 33 points and 11 rebounds for Boston.

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ROOK 🆚 VET BATTLE IN DALLAS!

Cooper Flagg: 36 PTS, 9 REB, 6 AST
Jaylen Brown: 33 PTS, 11 REB

JB (East Kia NBA Player of the Month for January) and the @celtics win their third straight on the road! pic.twitter.com/r4LkzI45L8

— NBA (@NBA) February 4, 2026

Earlier on Tuesday, Flagg was named Western Conference Rookie of the Month for January, making him a perfect three-for-three with the award to start the season. Brown, meanwhile, was named Eastern Conference Player of the Month for January.

The Celtics also traded for center Nikola Vucevic on Tuesday, acquiring the 15-year NBA veteran and a second-round pick from the Chicago Bulls in exchange for guard Anfernee Simons and a second-round pick, according to Shams Charania of ESPN.

Simons missed Tuesday’s game against the Mavericks due to personal reasons, according to the Celtics’ injury report.

Flagg will look to keep his scoring streak going on Thursday, as the Mavs host the San Antonio Spurs.