Ojeleye confirmed the news to Scout.com.
"Honestly it was a feeling I'd had for a while," he told TDD late Sunday. "I knew Duke was for me, but I wanted to make sure everyone was on the same page. The visit allowed my family to all get more comfortable with [the decision]."
The Blue Devils now have a pair of top 30 recruits in the 2013 class. Ojeleye joins four-star sharp shooter Matt Jones to make up their current class.
Ojeleye is ranked the No. 22 overall prospect in the 2013 class.