Moreno Valley (Calif.) Rancho Verde cornerback Ryan Henderson had been a commit since last spring, to Utah.
But when USC offered, Henderson's childhood favorite, it threw a wrench into things.
Henderson visited both Utah and USC in January, and settled on a school on Wednesday.
"I'll be playing for the Trojans," said Henderson.
The three-star is one of the best athletes in the country, winning the Nike SPARQ National Combine in July.
Henderson was selected to the 2011 UnderArmour All-America Game.