Duke's gameplan was obvious: don't let Nik Stauskas touch the ball, let alone shoot it, and force the rest of the Wolverines to find a way to score. Tyler Thornton and Matt Jones spent most of the game face-guarding Stauskas, limiting Michigan's leading scorer to four points—all on free throws*—on 0/2 shooting while the rest of the team faltered, save for a late push from Caris LeVert.
The 79-69 final score is rather deceptive; Duke led by double-digits for most of the game and pushed the margin as high as 18 points in the late stages, with Michigan unable to get closer than six points behind in the second half. The Wolverines scored 19 fruitless points in the final two minutes to carve eight points out of the deficit; by that time, Duke was content to keep Michigan at arm's reach with their free-throw shooting.
Simply put, this game was a major indictment of Michigan's supporting cast—at this point, it's clear that Stauskas is the offensive star, the rest playing supporting roles. Glenn Robinson III's woes on both ends of the court showed up at the worst time. He was nearly invisible offensively and ineffective when he attempted to get aggressive, scoring eight points on nine shots—with half those points coming after the game was well in hand—and failing to get to the free-throw line. He couldn't create a clean look for his jump shot or get around defenders to attack the basket. On the other end, he was pulled from the game at least once for repeated failures to box out his man, and when Michigan got lost on perimeter switches he was often involved.
Until Caris LeVert decided to put the team on his back in the second half, when he scored 20 of his team-leading 24 points, nobody else stepped up, either. Duke's aggressive hedging against the pick-and-roll made it difficult to get the ball to Mitch McGary in the post; even when he was open, the guards failed to get him the ball in good position—eight of his 15 points came in the final two minutes after Duke basically stopped boxing out. Derrick Walton had a couple very nice takes to the hoop in transition en route to seven points on 3/6 shooting; in the halfcourt, however, he couldn't facilitate the offense, tallying just one assist to three turnovers, one of which was a what-was-that pass deep into the Cameron Crazies. Zak Irvin was limited to 14 minutes and managed five points on five shots.
LeVert was certainly a bright spot in the second half, slicing his way into the lane with regularity, finishing well, and getting to the line; after going 2/5 in the first half with no free throw attempts, he shot 6/13 from the field in the latter stanza and knocked down all seven of his shots from the charity stripe. If there's one positive to take away from this game, it's his apparent willingness to be the go-to guy when Stauskas is rendered ineffective; after waiting on Robinson and McGary to be the guy, he had to step up and did so. Yes, he's occasionally overmatched by bigger players on defense; he's also very effective at the top of the 1-3-1 and is clearly the team's second-best offensive player this year.
His emergence in this game was too little, too late, unfortunately; Michigan needs more than one of their perimeter players to score consistently if they want to beat good teams, and they didn't have an answer when Duke took away Stauskas. I don't think this is a coaching issue; when an opponent is flat-out turning their back to the play and solely focusing on denying one player the ball, the rest of the offense should be able to create open looks while playing four-on-four. Aside from LeVert, nobody could manage this as Duke funneled everything inside—Michigan was 3/13 from beyond the arc—and forced the perimeter players to beat them off the dribble.
A loss to Duke at Cameron is nothing to be ashamed of, but the way this game played out should be very worrisome for Michigan. Stauskas has been identified as the main threat, and now there's a blueprint for stopping the offense cold unless someone else—not just LeVert—raises their level of play. This is still a young team that can improve dramatically over the course of the year; it's clear they're going to have to if they want to compete for a Big Ten title.
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*To further emphasize how much Duke took Stauskas out of the equation, three of his four free-throw makes came after Blue Devil technical fouls, not anything he did offensively.