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Harry Giles' knee, lack of defense should concern Duke fans

Duke looks loaded. Confident, too? Sure. But that doesn't mean the Blue Devils are without flaws. Phil Ellsworth / ESPN Images

The Duke Blue Devils are everyone's No. 1 entering the season.

Let's begin with the fact that there's a Hall of Famer -- and arguably the best coach in college basketball history -- leading the way. There's also the return of Grayson Allen, the early favorite to win the Wooden Award, and the addition of the top recruiting class in the nation, led by the top two players in the country.

Duke is loaded, and Mike Krzyzewski will have a chance to claim his sixth national title in Durham at the age of 70. This group is so deep that talented wing Luke Kennard might have difficulty getting meaningful minutes on a consistent basis, despite the fact he would be a starter on basically every other team in the nation.

While the Blue Devils are the overwhelming favorites to cut down the nets in Arizona come April, Coach K should still have concerns.