Maryland got close, but No. 7 Duke held on Wednesday.
Both the Devils and the Deacons are among D-1's defensive leaders, but they do it in very different ways.
Gerald Henderson scored 17 points to help No. 2 Duke rout Maryland 85-44 on Saturday, a victory that could propel the Blue Devils to the No. 1 ranking next week.
DeMarcus Nelson scored 19 of his 27 points in the second half, Gerald Henderson added 23, and the Blue Devils rallied to beat the Terrapins 93-84 Sunday night.