They led by 42-30 at halftime, having made 53.8 percent of their shots while dominating the boards, 18-9, and holding Duke to 30.8 percent shooting.
Michigan State shot under 40% from the floor, but held Duke to under 27%.
Geoff held Duke while he yowled and writhed.
Meanwhile, the Spartans' scratch-and-claw defense held Duke to just 44.6 percent shooting from the field, its lowest so far in the tournament.
But Stanford held Duke to a single series, and following a short punt, scored another touchdown before halftime.
Maryland held Duke to field goals in its first three possessions, and fell behind 9-0.
The only thing that appears to hold Duke back sometimes is its own wavering intensity.
Tina tried to master her resentment as she considered the power held bythe haughty Duke.
They held Duke to 15 of 43, or 35 percent.
The Seminoles (10-11, 3-7) held Duke to one field goal in the first seven and a half minutes.