Cooper Flagg and the Dallas Mavericks locked horns against the Utah Jazz in their third preseason game at the Delta Center on Monday. Mavericks coach Jason Kidd made one significant change to the starting lineup as point guard D’Angelo Russell made way for forward P.J. Washington.The decision had a major impact on Flagg’s role, with the former Duke phenom starting as the team’s point guard. The Mavericks experimented with an ultra-big lineup featuring Flagg alongside Anthony Davis, Dereck Lively II, Klay Thompson and Washington.Cooper Flagg played 21 minutes on the night and finished with 11 points on 3 of 12 shooting, including 1 of 6 from 3-point range, and 6 of 6 from the free-throw line. He also recorded seven rebounds, one assist, two steals and two blocks.Cooper Flagg through four quarters in preseason game vs. Utah Jazz (Oct. 13)Flagg attempted an audacious dunk just two minutes into the game. The rookie showcased his incredible athleticism, attempting to posterize Jusuf Nurkic, but couldn’t complete the dunk after being fouled. He made both free throws to open his scoring account.The 6-foot-9 star missed his next two field goal attempts before converting on his third try. He then missed two more shots and closed the first quarter with five points on 1 of 5 shooting, including 0 of 2 from beyond the arc.The comfort and confidence with which Flagg continued to go about his business were unmissable in the second quarter. He knocked down his first 3-pointer of the game during the period and disrupted the Jazz's offense with his stellar defense, both on the perimeter and on the glass.At halftime, Cooper Flagg had 8 points, five rebounds, one assist and one steal in 14:38 minutes. His shooting efficiency was slightly off as he went 2 of 8 from the floor, including 1 of 3 from 3-point range.Flagg struggled with efficiency in the third quarter as well, taking five shots and converting just one. However, the rookie continued to showcase his all-around skills, making an impact on the boards and on the defensive end of the floor. The rookie sat out the entire fourth quarter.