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Dillon Brooks has a lot at stake this season at Oregon

Dillon Brooks' stock rose last year. Will it go even higher, or could it fall? Ezra Shaw/Getty Images

New season. New roles. New goals.

Those factors don't always bode well. Players who performed well last season don't always repeat their success the following season. The reverse is also true: Some players go from being small-time contributors one season to headliners the next.

A player's season is largely defined by whether he reaches his potential and how he does it. And it doesn't always have to do with positioning for a professional career.

Here's a look at what players have the most to gain and the most to lose on each of the top 25 teams.