Todd McShay's updated Top 32: Ranking 2018 NFL draft prospects

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)

As we approach crunch time in the college football season, there's a lot still left to be determined before bowl season. However, the draft picture is slowly becoming clearer as more prospects stand out.

Here are my top prospects for the 2018 NFL draft right now:

Note: Players not in their senior year are marked with an asterisk.

1. Sam Darnold, QB, USC*

Grade: 95 | Previous rank: 1

No question, Darnold has made some questionable decisions throwing the football this season (11 interceptions is more than his total from 2016) -- but it hasn't changed my overall evaluation of him. He simply makes plays when it matters, which he showed again against Utah in the second half. Darnold's delivery still needs to be cleaned up, but his accuracy is phenomenal. He is the most complete quarterback in college football and a potential franchise signal-caller, if he decides to enter the draft.

2. Saquon Barkley, RB, Penn State*

Grade: 94 | Previous rank: 2