DALLAS (AP) — As Dallas rookie Cooper Flagg set the NBA record for points by a teenager with 49 on Thursday night in a 123-121 loss to Charlotte, he broke the franchise rookie scoring record he shared with Mark Aguirre — whose jersey was retired at halftime. Such a special night for him and the whole organization,” said Flagg, who turned 19 in December. 1 draft pick last summer from Duke was playing his first NBA game against Kon Knueppel, his roommate as Blue Devils freshmen last season. “Cooper, he played like the best player we’ve played all season,” said Knueppel, who set a franchise rookie record hitting eight 3-pointers. “Just having fun.”The two leading candidates for Rookie of the Year finished the night with Flagg averaging 19.5 points per game, Knueppel 18.9.