Mavs rookie Cooper Flagg, the 2025 No. 1 overall pick, hurts his left shoulder early in the 1st quarter of Monday's Dallas loss to the Thunder.

Mavs guard D’Angelo Russell had a great reaction when asked by a reporter about Cooper Flagg’s 22-point performance.

Sunday, Flagg got back to his winning ways, as the Mavericks beat the Toronto Raptors 139-129 at American Airlines Center. Flagg scored 22 points, grabbed four rebounds and dished four assists as Dallas’ offense showed signs of life after two poor showings to begin the season.

Dallas Mavericks rookie Cooper Flagg’s NBA debut this week wasn’t just a basketball milestone—it was a case study in modern collecting strategy. Flagg wore three separate Rookie Debut Patches across different jerseys during his first NBA game,

Head coach Jason Kidd said after Monday's 101-94 loss to the Thunder that Flagg played through shoulder soreness and the team will "see how he feels tomorrow," Noah Weber of TheSmokingCuban.com reports. He finished with two points (1-9 FG, 0-3 3Pt), two rebounds and two steals across 31 minutes.

Here is what you need to know when the 18-year-old steps onto the court for the first time tomorrow against the Spurs.

Cooper Flagg's NBA debut was uneven but it's foolish to worry about an 18-year-old who can do so many things that contribute to winning.