LAS VEGAS (AP) — Rookie Cooper Flagg may not have been happy with his professional debut Thursday night in the NBA Summer League, but he still drew rave reviews all around after the Dallas Mavericks defeated the Los Angeles Lakers, 87-85. Flagg finished with 10 points on 5-for-21 shooting, including 0 for 5 from 3-point range. He also had six rebounds, four assists, three steals and the biggest block of the night.