UNC vs. Top Defenses in the Roy Williams Era Posted Feb 22, 2017 Despite allowing a staggering 1.45 points per possession (90 points on 62 possessions) in its last game against Virginia Tech, Louisville remains fifth in the nation in adjusted defensive efficiency. So how has North Carolina performed against top-10 defenses (based on Ken Pomeroy’s adjusted defensive efficiency) in the 14-year Roy Williams era? Let’s look. (The Secondary Break)