Undrafted rookie Ryan Nembhard stole the show while Cooper Flagg showed flashes of star potential in the Mavericks’ Summer League opener. Dallas edged out the Lakers in a thrilling finish—here’s how the young duo made their mark.

LAS VEGAS (AP) — Cooper Flagg strolled into UNLV’s Thomas and Mack Center at 4:17 p.m. on Thursday, wearing Dallas Mavericks gear, bright white New Balance shoes, and an emotionless look on his face as he passed through security.

The No. 1 pick in last month’s draft scores 10 points in 32 minutes and blocks a shot that leads to the game-winning 3-pointer as Dallas edges the Lakers, 87-85. Cole Swider has 22 points and 10