Mel Kiper's top 10 prospects at each position for 2018 NFL draft

Kiper says Mayfield will 'present toughest evaluation' (0:46)

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. Stay tuned for some more draft content next week as we get closer to the end of the college football season: