SALT LAKE CITY — Luka Doncic couldn’t sleep after playing the game of his life.

‘He didn’t have any fear’

Doncic wanted to play so often that Jernej Smolnikar, another of his youth coaches, worried about how his prepubescent body would absorb some of the drills. He occasionally tried sending Doncic home, only for Doncic to plead with his parents to call Smolnikar to let him back on the court.

Those who recall Doncic’s early days in Slovenia describe his play as the merging of genetic gifts and tunnel-vision devotion. His father, Sasa Doncic, played professionally for years. He had “the greatest court vision,” said Damir Radenovic, who practiced with Sasa Doncic and is the marketing director for the Basketball Federation of Slovenia.