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Road games build a team's character and help a team play through adversity.
So far this season, Duke has played one true road game and lost it. Since it was a conference game, it means the Blue Devils played no true non-conference road games.
It has recently been Krzyzewski's position to play non-conference opponents, aside from Big 10/ACC Challenge games, on neutral sites.
Those type of teams are only going to be seen outside the conference, namely in the NCAA Tournament, where the games are played on neutral sites. The only real reason to play a non-conference opponent on their home court is to prepare for the conference season's road games.
As of yet, no coach has ever said his ultimate goal was to win all of the conference road games. Not that they aren't important, but Coach K builds his non-conference schedule to prepare for the NCAA Tournament, not conference road games.