The Dallas Mavericks faced the Boston Celtics at TD Garden on Friday night in a game that held personal significance for rookie forward Cooper Flagg. While Dallas lost 120-100, that night meant more than the score for the 19-year-old Maine native, who played his first professional game in Boston against someone he has idolized for years, Jayson Tatum.
Flagg, the No. 1 overall pick in the 2025 NBA draft, received an unusual welcome during pregame introductions. Boston fans, who typically criticize opposing starters at TD Garden, instead greeted the rookie with loud cheers. This reaction surprised Mavericks head coach Jason Kidd. Many family members and friends from Maine were in attendance near the flag for the homecoming game.
Facing Tatum added emotional weight to the matchup. Flagg grew up watching the Celtics and followed Tatum's development closely, including his college career at the Duke Blue Devils under coach John Scheyer. Flagg also played one season at Duke before entering the NBA.
"It was unbelievable. There's a lot of levels to it," Flagg said after the game when asked about playing against Tatum. "He's someone I've idolized growing up, watching him come up through the ranks and ranks. I've watched him at Duke, and have been inspired to follow in his footsteps and play [Jon] Scheyer, and then obviously getting into the league is just unrealistic. It was really special for me to have this experience tonight.”
Sharing with Cooper Flagg/Tonight Jayson Tatum on the reception from the Boston/Maine crowd:
"There are so many levels to it. He's a guy I idolized growing up...to see him at Duke and follow in his footsteps...it's surreal. It's really special for me to get this... pic.twitter.com/jq2CMbYptK
- Mike Curtis (@MikeACurtis2) 7 March 2026
The rookie finished with 16 points, eight rebounds and six assists in 30 minutes, but his efficiency wasn't there, shooting 7 of 23 from the field and 0 of 4 from three-point range. He also committed three turnovers and had a minus-17 rating. The performance came just two games in after an eight-game absence due to a left medial sprain and returned for the second consecutive night.
Although his numbers were modest, Flagg continued to carry a heavy workload for Dallas. The 6-foot-9, 205-pound forward often serves as the team's point-forward, running several offensive sets despite the Mavericks' 21–42 record.
Tatum's return to action was another major storyline. Playing his first game since rupturing his Achilles tendon last May, he finished the night with 15 points, 12 rebounds and seven assists in 27 minutes, and shot 6 of 16 from the field.
Next, the Mavericks will travel to Toronto to face the Raptors on Sunday, while the Celtics will visit Cleveland to face the Cavaliers.
