Williams had 26 points and 13 rebounds, Redick scored 35 points for the second straight game, and Duke never trailed in a 96-88 victory Saturday. Greg Paulus added a career-high 16 points and seven assists for the Blue Devils.
The Blue Devils (23-1, 11-0 Atlantic Coast Conference) were swept by the Terrapins last season and had lost three of their last four at Maryland. Williams and Redick were determined to buck the trend, and together they provided Duke with its second win over Maryland in the span of a month.
Williams went 10-for-15 from the field, and Redick made four three-pointers and was 13-for-14 at the free throw line. Led by Redick, who needs one more 3-pointer to tie Curtis Staples of Virginia for the NCAA career mark (413), Duke connected 11 times from beyond the arc. Maryland made only four.
Nik Caner-Medley scored 22 points and James Gist had 13 points and 10 rebounds for the Terrapins (15-8, 5-5). Maryland was trying to avenge a 76-52 loss at Duke last month but simply didn't have enough weapons to offset the Williams-Redick combination.
Duke opened both halves with 11-4 runs. The first one enabled the Blue Devils to take control early, and the latter provided Duke with an 11-point lead after Maryland closed to 42-38 at halftime.
Redick, who had 35 points in the win at North Carolina on Tuesday, began the second half with a 3-pointer and Williams added a layup. It was 49-42 before a jumper by Redick and a dunk by Williams put the Blue Devils up by 11.
Maryland spent the rest of the game trying to close the gap. But every time the Terrapins made progress - raising the noise level of the sellout crowd - Duke had an answer.
It was 64-54 before Williams made a layup and Redick sank a triple for a 15-point lead. Then, after the Terrapins closed to 83-75, Sean Dockery hit a 3-pointer for the Blue Devils.
Maryland never cut the gap below seven points after that.
Before the game, Gary Williams was recognized as the winningest men's basketball coach in Maryland history during a ceremony that included the man whose record he broke, Lefty Driesell.
Williams then set out to earn his 350th win with his alma mater against a team that had beaten him 29 of 40 times during his 17-year stint at Maryland.
Duke hit its first four shots, including three three-pointers, to take an 11-4 lead. Maryland closed to 13-12 before Williams scored on an alley-oop and Greg Paulus added a three for a six-point lead.
The Blue Devils did all this without a contribution from Redick, who finally made his first basket with 13:37 left in the half, a 3-pointer that made it 21-14.
Minutes later, Williams scored five points, Redick made two layups and Paulus added a 3-pointer in a 13-4 spurt that put Duke up 36-24. The Terrapins went nearly 5 minutes without a basket before Gist made a layup early in a 12-4 run that made it 40-36.
Duke went 6-for-11 from beyond the arc in the first half; Maryland was 0-for-3.