The youngest player in the NBA played his first preseason game with the Dallas Mavericks on Monday night, and Cooper Flagg looked plenty comfortable at the highest level of professional basketball.

Flagg had an early warm-up against some of the best rookie and second year players during NBA Summer League , but Monday night’s preseason game against the returning champion Oklahoma City Thunder was his first chance to get game action with the Mavs main lineup.

And the 18-year-old from Newport, Maine wasted little time demonstrating his balanced approach on both sides of the floor.

Flagg was in the starting lineup for Dallas, and though he didn’t have any points in the first quarter, he quickly started hauling in rebounds and provided a block around the rim that launched an emphatic fast

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