Cooper Flagg, the No. 1 overall pick in the 2025 NBA Draft by the Dallas Mavericks, is widely expected to make his professional debut at the NBA Summer League in Las Vegas. Multiple sources confirm that fans will get their first look at Flagg in a Mavericks uniform during the NBA 2K26 Summer League, scheduled for July 10-20, 2025, at the Thomas & Mack Center and Cox Pavilion on the UNLV campus.
Flagg and his player development coach have specifically been preparing for Summer League action, focusing on NBA-level conditioning, skill work, and adapting to professional game situations. This preparation aligns with the Mavericks’ plans, as Flagg is projected to be an immediate starter and a central piece of the team’s new era following the departure of Luka Dončić.
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While official Summer League rosters are typically announced closer to the event, all available reporting and statements from Flagg’s camp and team sources strongly indicate that he will participate in Las Vegas, barring any unforeseen circumstances.