The Blue Devils suffered an unexpected 15-point whipping at the hands of St. John's last weekend, but returned to Atlantic Coast Conference play with a typical performance.
Singler scored 22 points while making 10-of-15 shots from the field. Duke shot 53 percent, limited Maryland to 20 field goals and turned the ball over a mere eight times.
Nolan Smith contributed 21 points for the Blue Devils (20-2, 7-1 ACC). Duke has a half-game lead over North Carolina at the top of the conference race and those two old rivals meet next week.
Jordan Williams had 20 points and 10 rebounds for Maryland (14-8, 4-4). The Terrapins had won their previous three games.