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

Michigan's defense will test Barkley (1:23)

Penn State running back Saquon Barkley has emerged as one of the best players in college football, but Saturday he'll have his toughest test yet when the Nittany Lions take on the Wolverines. (1:23)

We're nearly halfway through another exciting college football season, and the standout prospects are cominginto focus.

There aren't too many changes to this new list, but we have a new cornerback making his debut in the top 15.

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

Note: Underclassmen are marked with an asterisk.

1. Sam Darnold, QB, USC*

Grade: 95 | Previous rank: 1

Darnold has made some questionable decisions throwing the football this season (nine INTs ties his total from last season), but it hasn't changed my evaluation of him. He simply makes plays when it matters, as seen again against Utah in the second half. His 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.

2. Saquon Barkley, RB, Penn State*

Grade: 94 | Previous rank: 2

Barkley hasn't played against terrific competition, but he looks like the best running back in the nation this season. With good balance and terrific lateral agility, he can run away from the defense when he gets to the second level. He did it all against Iowa in Week 4, willing Penn State to a 21-19 win to keep the team undefeated. He has a big matchup this weekend against a stout Michigan defense.