And then there were four. While Duke (32–6) and coach Mike Krzyzewski are authoring a storybook signoff as West Region champs, archrival North Carolina (28–9), the No. 8 seed in the East Region, crashed the Final Four and stands in the way of any epic sendoff the Blue Devils might have planned Monday night. Duke opened as a 4.5-point favorite at PointsBet but the line had moved to 3.5 by Thursday with North Carolina drawing 51 percent of the spread bets and 66 percent of the handle. The 4.0-point line at DraftKings had drawn more action for the Blue Devils with 54 and 55 percent, respectively. The Tar Heels already spoiled Coach K’s homecourt goodbye in a game coach Hubert Davis believes flipped the switch for what he felt was an underachieving team up to that point. When his group walks into the Superdome in New Orleans for the first …