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For much of the night, he had to like what he saw.

Maryland kept things tight early, forcing 10 first-half turnovers — or, more than the Blue Devils committed in five games — while holding them to an uncharacteristic 1-for-10 shooting from 3-point range. Singler’s tip-in just before the buzzer put Duke up 32-31, its slimmest halftime lead of the season at Cameron.

It didn’t last long. The Terrapins reeled off seven quick points in the opening minute of the second half and went up by six on Sean Mosley’s tip-in.

“I thought whatever we told them at halftime was not working,” Krzyzewski said. “In fact, I was sure it wasn’t working. … We didn’t run what we were supposed to run. In sport, you can get knocked back because you play good people. We got knocked back.”