Williams, the No. 2-ranked player from his home state, is the No. 11 point guard and No. 46 overall player in the 2017 class, according to 247Sports' composite rankings.
It's still early in the recruiting game when it comes to the 2017 class, but his commitment should push the Fighting Illini into the top 25 in 247Sports' class rankings. Prior to Williams' commitment, the team ranked 26th with a commitment from 3-star shooting guard Javon Pickett, who also hails from Illinois.
Fourth-year head coach John Groce seems to be looking within the state to complete his roster, and landing Williams is a good sign.
The high school junior is the son of former Illinois guard Frank Williams, who ranks No. 16 on the Illini's all-time scoring list, per Vinnie Duber of CSNChicago.com. Duber reported that the younger Williams had offers from several in-state schools as well as the Indiana Hoosiers.
Williams seems to be happy with his decision, per Derek Piper of the Illini Inquirer.
"I just felt like it was the place for me to be. It feels like home," he said. "I know they will take good care of me just like my mom and dad."
It's hard to say at this point how Williams will fit in, but Illinois has seven guards on the roster who will have graduated by the time he arrives. However, playing time won't be guaranteed. Even though the Illini's 2016 class ranks last in the Big Ten, the program's only recruit is 3-star point guard Tejon Lucas.
All recruiting rankings courtesy of 247Sports unless otherwise noted.