Dallas Mavericks rookie Cooper Flagg delivered a breakout performance in his third NBA game on Sunday against the Toronto Raptors. The 18-year-old tallied a career-high 22 points, powering Dallas to a 139-129 victory that helped the Mavs avoid an 0-3 start. Among various winning plays, Flagg notched the first highlight dunk of his young career.

Flagg finished with four rebounds, four assists and a block to go along with his 22 points. His viral dunk came in the third quarter. Catching pass from D’Angelo Russell in transition, Flagg took one dribble with his left hand before exploding into the air and slamming a one-handed flush over 6-foot-11 Raptors center Sandro Mamukelashvili while drawing a foul.

Entering the fourth, Toronto mounted a 7-0 push, but Flagg steadied the Mavs ship wi

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