Kiper's Big Board for 2019 NFL draft: Top 25 prospects and positional rankings

The 2019 NFL draft is still more than five months away, but it's never too early to make updates to the Big Board.

I also have a brand-new batch of positional rankings for the draft -- my top 10 prospects at every position -- in addition to my top 25 rankings overall below. Nick Bosa is still No. 1, but there is some movement down the list.

Underclassmen have until Jan. 14 to declare for the draft, so these rankings could look much different in a month.

A few notes before I get started, same as always:

  • These aren't detailed scouting reports. I still have a lot of work to do on these prospects.

  • Height and weight are based on what we have from schools. We don't get official numbers until the NFL scouting combine in February.

Note: One asterisk denotes the player is a junior, and two asterisks denote the player is a redshirt sophomore in 2018.

Jump to the positional rankings

1. Nick Bosa, DE, Ohio State*

Height: 6-foot-4 | Weight: 263 pounds | Previously: 1

I don't expect the core muscle injury that ended Bosa's Ohio State career to affect his draft stock. He could go wire-to-wire as my top-ranked prospect. The last guy to do that? All the way back to ... 2017, when pass-rusher Myles Garrett ended up going No. 1 overall. Bosa is an elite pass-rusher who is advanced for his age in his technique -- you can probably thank his brother, Joey, and dad, John, both former first-round picks. He'll finish his Buckeyes career with 17.5 sacks in two-plus seasons, most of which were in a loaded line rotation.

2. Quinnen Williams, DT, Alabama**

Height: 6-4 | Weight: 289 | Previously: 2

Williams was one of college football's best players -- not just defenders -- this season. He dominated LSU with 2.5 sacks and 10 total tackles, and he finished the season with eight sacks and 18 total tackles for loss. When I wrote about Williams after the LSU game, I mentioned his ability to use his hands to disengage from blockers. He is so good at destroying double-teams. And remember, Williams hasn't played much football -- he has room to grow. I'm excited to see Williams & Co. try to shut down Kyler Murray and that Oklahoma offense.