No team is perfect. Each one has a weakness, something that can be better than the current state.

This is the case for every one of the 350-ish college basketball teams as we slowly inch toward the 2014-15 season, even those that will begin the year atop polls and best-of lists. There's something of a concern for each, something that like a loose thread on a sweater could cause everything to unravel if pulled on instead of snipped.

Using Bleacher Report's preseason basketball rankings from earlier this summer, we've listed one issue that each of the top 20 teams has to address before the...

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