"You just hit this kind of mood," Stewart said after the game. "Where everything just feels good."
Stewart scored a season high 28 points, making eight consecutive shots — including five from three-point range — before a jumper bounced off the rim.
"He shot the ball great," coach Andy Enfield said before crediting McLaughlin for getting players "wide open shots."
USC got off to a rocky start in the first half —shooting 44% — as Jonah Mathews' three-point shots missed their mark and a Metu dunk attempt bounced off the rim.
There were lapses defensively but the Trojans played well enough to maintain a lead through most of the half.