Cooper Flagg was in action when the Dallas Mavericks hosted the Indiana Pacers at the American Airlines Center on Wednesday. The star rookie was in the starting lineup alongside Anthony Davis, Klay Thompson, P.J. Washington and Max Christie.Flagg started slow but was phenomenal in the second half after Anthony Davis was ruled out. The rookie recorded his second career double-double and took the Mavericks to a cracking 107-105 win at home.In the end, Flagg finished with 15 points, 10 rebounds, four assists and one block in 35 minutes. He shot 6 of 11 from the floor and didn't attempt a single 3-point shot. The Mavericks forward converted all three free throws. He committed two turnovers and registered a -7 rating.Cooper Flagg Highlights vs. Indiana Pacers (Oct. 29)Flagg got off to a slow start, showing little aggression on the offensive end. The former Duke phenom allowed the game to come to him rather than dictating terms. He took just one shot in the opening period, a highlight dunk. After the first quarter, Flagg had two points and one rebound in eight minutes.Flagg got more engaged on offense in the second period and put up three shots. He missed two and made one, but his overall impact was much better. He also racked up rebounds and assists as the Mavericks played catch-up basketball for the major part of the first half.At halftime, Cooper Flagg had four points on four shots in 17 minutes. He pulled down five rebounds and dished out two assists while committing two turnovers in the process.With Anthony Davis ruled out, Cooper Flagg dominated on the glass and pulled down critical rebounds. The Mavericks flipped their three-point halftime deficit into a 10-point lead heading into the fourth quarter. Flagg was instrumental in the turnaround as he dropped four points and grabbed three rebounds in the penultimate period.The 6-foot-9 forward kept his foot on the accelerator and made huge plays down the stretch. He backed down Mac McClung and scored a jump hook over him in the fourth quarter before hitting the "too small" sign.