No. 1 overall pick Cooper Flagg didn't shoot the ball well, but he was able to impact winning in a big way for the Dallas Mavericks in their Summer League opener. The performance didn't come without some jitters that Flagg says he has gotten through after his debut.

Thursday night’s matchup between Cooper Flagg and the Dallas Mavericks and Bronny James and the Los Angeles Lakers was the fourth-most-watched Summer League game ever, per ESPN.

LAS VEGAS (AP) — Cooper Flagg strolled into UNLV’s Thomas and Mack Center at 4:17 p.m. on Thursday, wearing Dallas Mavericks gear, bright white New Balance shoes, and an emotionless look on his face as he passed through security.