Two games into his professional career, and Cooper Flagg is done in the NBA summer league, according to multiple reports.The Dallas Mavericks, who selected Flagg with the No. 1 overall pick in last month’s draft, opted to pull the 6-foot-9 star from Las Vegas action following a 31-point outing in Saturday’s loss to No. 2 pick Dylan Harper and the San Antonio Spurs.Flagg was 10-of-21 shooting in that game, an improvement from a 10-point, 5-for-21 performance in Thursday’s win over the Los Angeles Lakers.”I think it’s a new environment, new setting,” Flagg said after the loss to the Spurs. “They want to see me be aggressive and do that type of stuff.