Sports

CELTICS 101, HEAT 69

Marcus Thornton leads Celtics’ summer league rout

Waltham, Massachusetts - 6/30/2015 - Boston Celtics draft pick Marcus Thornton speaks to members of the media during a media availably introducing the team's draft picks in Waltham, Massachusetts, June 30, 2015. (Keith Bedford/Globe Staff)
Keith Bedford/Globe Staff
Marcus Thornton scored 21 points Tuesday in a summer league game vs. the Heat.

LAS VEGAS — The NBA’s summer circuit has been an adjustment for Celtics second-round draft pick Marcus Thornton. The 45th overall choice had scored just 8 points over Boston’s five summer league games in Utah and Las Vegas.

But on Tuesday night, Thornton tallied 21 points in 19 minutes, leading the Celtics to a 101-69 romp over the Heat.

“Getting more time, I’ve been able to get a better flow and a better rhythm,” Thornton said. “Getting those extra minutes really helped me tonight, and it was great to be a part of that.”

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With the win, the Celtics improved to 3-0 in the Las Vegas summer league and earned a bye in the first round of the playoffs, which begin Wednesday.

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Jonathan Holmes, an undrafted free agent from Texas, added 14 points and 5 rebounds and first-round pick R.J. Hunter added 13 points.

Heat forward Justise Winslow, whom the Celtics had aggressively tried to trade up and acquire on draft night, had 5 points in 10 minutes.

Celtics forward James Young missed his third straight game because of a hip pointer. Young suffered the injury in the first half of the Celtics’ win over the Spurs last Thursday.

He jogged some stairs at the Thomas & Mack Center on Tuesday morning and did some stretching exercises while his teammates took part in shootaround. Young said the swelling in his hip has continued to decrease.

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“We’ve still got a few days left,” Young said, referring to the Las Vegas summer league. “Hopefully I can get back toward the end and just get some runs in with the team.”

Adam Himmelsbach can be reached at adam.himmelsbach@globe.com. Follow him on Twitter @adamhimmelsbach