DALLAS -- Rookie Cooper Flagg caught the look-ahead pass as he crossed the halfcourt line, took one dribble and a couple more long strides and launched for a spectacular, and-1 slam dunk.

The finish over Toronto's Sandro Mamukelashvili elicited a roar from the crowd at the American Airlines Center, a far cry from the scattered boos during the Dallas Mavericks ' 0-2 start. It was the highlight of an excellent all-around performance in the first NBA victory for Flagg, the No. 1 overall pick who finished with 22 points, four rebounds and four assists.

"The fans have showed up for the first three games and I thought tonight was really the first time we gave 'em something to be excited for and be on their feet for," Flagg said after the 139-129 win Sunday night.

The Mavs snapped out of

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