Mel Kiper Jr. explains why it is difficult to evaluate Oklahoma QB Baker Mayfield. (0:46)
Time for my latest position rankings for the 2018 NFL draft, which combines seniors and underclassmen and features a top 10 for every position.
More NFL draft coverage: Primer: Kiper, McShay answer 25 questions | Kiper's latest Big Board | McShay's latest Top 32
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