Luka Doncic’s case for Rookie of the Year just got stronger Tuesday night with a clutch performance to close out the Portland Trail Blazers. The Dallas Mavericks do-everything guard was already having a big night as Dallas built a fourth-quarter lead at home. With Dallas holding a 105-99 lead with a little more than a minute remaining, Doncic convinced everybody in the building — Portland guard Evan Turner included — that he was making a move to the basket as the shot clock dwindled.