Alabama's annual exodus of underclassmen to the NFL began again Friday when four players declared for the draft, including star defensive lineman and potential top-five pick Quinnen Williams.

Quinnen Williams was arguably the most dominant defensive player in the country after playing sparingly last season and redshirting the season before. The 6-foot-4, 295-pound Birmingham, Alabama, native won the Outland Trophy, given to the best interior lineman in college football, and finished the season with 71 tackles, 19.5 tackles for loss, 8 sacks and 12 quarterback hurries. ESPN ranks him as the No. 2 draft-eligible prospect.

"I believe it's time for me to take the next step in my football career and declare for the draft," Williams said.