DALLAS — As Dallas rookie Cooper Flagg set the NBA record for points by a teenager with 49 on Thursday night in a 123-121 loss to Charlotte, he broke the franchise rookie scoring record he shared with Mark Aguirre — whose jersey was retired at halftime.

Flagg's 49 points are the most ever by a teenager in the NBA, but his former Duke roommate got the win.

Rookie Cooper Flagg keeps joining elite NBA lists, now becoming the highest-scoring teen in history. Check out what social media said about it

Duke products squared off in Hornets' 123-121 win over Dallas Mavericks on Thursday night in first official NBA matchup against each other.

Shortly after Mark Aguirre’s number was enshrined in the AAC rafters, Flagg broke the Mavericks great’s franchise record for points in a game by a rookie.

Mavs PR: Cooper Flagg had 40 pts, 7 rebs and 2 asts through three quarters tonight against CHA. Flagg is the first teenager in the play-by-play era (since 1996-97) to score 40 points through three quarters. Flagg is also the first rookie in the play-by-play era to accomplish the feat.