CHAPEL HILL, N.C. (AP) - North Carolina's defense struggled during coach Larry Fedora's first season.
The Tar Heels know things must change if they want to hang with sixth-ranked South Carolina in next week's road opener, much less contend for an Atlantic Coast Conference championship by November.
Senior defensive end Kareem Martin says the team is more familiar with the 4-2-5 scheme the team installed last season, giving them more experience and confidence.
UNC ranked 10th among the league's 12 schools last year by allowing 32.9 points in conference games. That included a stretch in which the Tar Heels allowed 500 yards in three straight games and at least 33 points in four of the final five, including 68 in a home loss to Georgia Tech.