(Portland, OR)  --  The Trail Blazers held their initial NBA Summer League workout with first-round picks Zach Collins and Caleb Swanigan participating.  The roster includes guard R.J. Hunter, who was a Celtics' 2015 first-round selection, and small forward Jordan Adams, who was a Grizzlies' 2014 first-round choice.  The Blazers will open play against Utah on Sunday.  All games are In Las Vegas.