The Portland Trail Blazers have exercised their team options on contract extensions for guard Scoot Henderson, forward Kris Murray and center Donovan Clingan. The Blazers announced the extensions, which were largely a formality, with the three players on Tuesday, a day before the team's season opener at home against the Minnesota Timberwolves. Henderson, in his third season with the Blazers, is sidelined for the start of the season with a left hamstring tear.