USC defensive lineman Leonard Williams, who announced he would make himself available for the NFL draft, has signed with agent Eugene Parker of Relativity Sports. Williams, 6-foot-5 and 300 pounds, is projected as a possible top-five pick. Parker represents Arizona Cardinals receiver Larry Fitzgerald and Buffalo Bills receiver Sammy Watkins, among others. Questions about USC? Email me at LNThiry@gmail.com or tweet @LindseyThiry and I will respond to select messages in a weekly USC Now mailbag.