This could be the first and last all in one for Duke freshman sensation Cooper Flagg, who gets his first taste of the Tobacco Road rivalry at Chapel Hill on Saturday night.The final stop in the regular season for No. 2 Duke comes against streaking North Carolina in another edition of the storied rivalry Saturday night with plenty at stake.”I think it’ll be a really fun environment to play in,” Flagg said. “Obviously, they’re going to pack it out and it’s going to be a crazy environment. They’re a really good team and they’ve been on a tear recently as well.”Duke (27-3, 18-1 Atlantic Coast Conference) has won seven games in a row. The Blue Devils have posted nine victories by a margin of 30 points or more, including the last four outings.”It’s not normal what these guys are doing, and we don’t take it lightly, and we don’t take it for granted,” Duke coach Jon Scheyer said. “We know the job (is) not done. It doesn’t entitle you to any more wins the rest of the season.”North Carolina (20-11, 13-6) owns a season-best six-game winning streak. Many college hoops pundits opined this week that the Tar Heels still need a notable victory to bolster their chances for an NCAA Tournament invitation.”I feel like every game, our guys are seeing and experiencing what it looks like to consistently play at that level and stay at that level, and what that does for us as a team,” North Carolina coach Hubert Davis said.Duke might be in position to move to No. 1 in the country because top-ranked Auburn lost this week at Texas A&M. But that’s not the No. 1 focus of the Blue Devils, who understand further fallout is a risk with a loss at UNC.Should the Blue Devils lose to North Carolina and Clemson and Louisville win, it would leave Duke as the No. 3 seed for the ACC tournament.Duke won the first meeting vs. North Carolina 87-70 on Feb. 1, with freshmen Kon Knueppel and Flagg racking up 22 and 21 points, respectively. The Blue Devils led that game by 32 points with about nine minutes to play. North Carolina’s leading scorers were RJ Davis and Drake Powell with 12 points apiece.The Tar Heels have reached the 20-win level for the 65th time, with a dominating performance in Tuesday night’s 91-59 rout at Virginia Tech.North Carolina has had four consecutive games with five double-figure scorers, something that had never been accomplished for the program within ACC play.