Duke looked very good in its win over Michigan on Tuesday night, getting 24 points and nine assists from Quinn Cook and holding Nik Stauskas to just four points on two shots. The Blue Devils looked like the top-10 team we all thought they should be.

But it was impossible not to notice one thing: where is Rasheed Sulaimon?

The 6-foot-4 sophomore from Houston started 33 games last season, averaging 11.6 points. He was expected to blossom into an all-conference player this season, and some preseason mock drafts pegged him as a first-round pick in June's NBA draft.

Yet on Tuesday, Sulaimon was nowhere to be found – he didn't play a single minute.

This doesn't seem like an isolated incident, either; Sulaimon has been struggling most of the season and seems to be squarely in head coach Mike Krzyzewski's doghouse.

Since scoring 33 points in the first two games of the season, Sulaimon has totaled 24 points in the last seven games. During that span, he is shooting 6-for-28 from the field and 1-for-9 from 3-point range. He has only started four of the eight games he played.

So what's the deal?

"As a man, he has to step up and accept what he needs to do," guard Tyler Thornton told Laura Keeley of the Raleigh News & Observer. "We need him. That's all I can really say about that."

"He knows what he needs to do, I don't really want to speak on that," he said. "He have a week and a half until our next game. We have a lot of practice time. Hopefully we can get what we need out of him in that span."

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Now, this brings us to the next question: how much does Duke need Sulaimon going forward?

After all, Tyler Thornton has done an admirable job replacing him in the starting lineup, giving Duke a secondary ball-handler and a very good defender. Moreover, Andre Dawkins and Matt Jones stepped up off the bench against Michigan. Both are knockdown shooters, and Jones did a fine job chipping in to guard Stauskas.