"I just thought it was the right fit for me, Williams told Scout.com. "It's a long process, and I just felt it was a great fit for me at my position."
"They came after me real hard and plus it's almost in my backyard basically. It's about 20 minutes away, so it's right there and they were one of the first schools to come after me."
The 6-foot-7 combo forward took in USC's first exhibition game of the season Monday night and following the contest Williams had an opportunity to chat with the USC head coach.
"I was talking to coach Floyd after the game and I just decided I wanted to go there," Williams said.
USC assistant coach Bob Cantu was the point man on Williams' recruitment and the two developed a strong relationship.
"He was the first one to call me, him and coach Floyd," Williams said. "We've had a great connection since we first met."
After an impressive summer, Williams picked up a variety of collegiate interest. Among the schools trying to lure Williams were Nevada, Arizona State and San Diego. Williams claimed scholarship offers from all three programs.
Williams will join Noel Johnson, a product of Fayetteville (Ga.) Fayette County, and Phoenix (Ariz.) St. Mary's standout Demetrius Walker to make up USC's current 2009 recruiting class.