The talented forward out of Etiwanda (Calif.) High made his pick early Saturday morning.
"Byron Welsey Jr, after eing offered several weeks ago, committed to USC last night," Wesley Sr. told Scout.com.
The Trojans have been on quite a roll lately. New USC head coach Kevin O'Neill has five commitments in 2010 and Wesley joins Gelaun Wheelwright as his second pledge in 2011.
Wesley, a 6-foot-4, 190-pound wing, is ranked No. 16 on Scout.com's 2011 small forward list and is rated as a four-star prospect.